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PHP function reference table

PHP function reference table

remove spaces or characters
function detailed explanation
trim delete spaces or other predefined characters at both ends of a string
rtrim delete the space or other predefined characters on the right side of the string
chop alias for rtrim()chop() is different from perl's chop() function, which deletes the last character of the string.
ltrim delete the space or other predefined characters on the left side of the string
string generation and conversion
function detailed explanation
str_pad use another string to fill the string for the specified length
str_split convert strings to arrays
strrev invert string
wordwrap break string to a specified number of strings
str_shuffle randomly disrupt a string
parse_str parses strings into variables
number_format format strings by thousand-bit grouping
string case conversion
function detailed explanation
strtolower convert string to lowercase
strtoupper/td> convert string to uppercase
ucfirst convert the initial letter of a string to uppercase
lcfirst convert the first letter of a string to lowercase
ucwords convert the first letter of each word in the string to uppercase
html tag association
function detailed explanation
htmlentities convert characters to html entities
htmlspecialchars predefined string to html encoding
nl2br insert html newline tag before all new lines of a string \nconvert to tags
strip_tags remove html and php tags from strings
addcslashes escape characters in a string using backslashes in c style
stripcslashes anti-reference a string escaped using addcslashes()
addslashes referring strings with backslash
stripslashes remove escaped characters added by addslashes
quotemeta some predefined strings in strings are preceded by backslashes
chr returns characters from specified ascii value
ord returns the ascii value of the first character of the string
string comparison
function detailed explanation
strcasecmp comparison of two strings insensitively
strcmp comparison of two strings case sensitive
strncmp compare the first n characters of the string, case sensitive
strncasecmp compare the first n characters of the string, case-insensitive
strnatcmp comparison of string lengths in natural order, case-sensitive
strnatcasecmp natural order method compares string lengths, case-insensitive
string search replacement
function detailed explanation
str_replace string replacement operation, case sensitive
str_ireplace string replacement operation, case-insensitive
substr_count count the number of times a string appears in another string
substr_replace replace a string in the string as another string
similar_text returns the number of characters of the same string
strrchr returns the string from the last occurrence of a string in another string to the end
strstr returns a string from the start position to the end position of one string in another string
strchr alias ​​for strstr, returns the string from the first occurrence of a string in another, starting from the end of the first occurrence of a string in another
stristr returns a string from the start position to the end position in another string, case-insensitive
strtr convert certain characters in a string
strpos find the first location of certain characters in a character
stripos find the first location of certain characters in characters, case-insensitive
strrpos find the last location of certain characters in the character
strripos find the last location of certain characters in characters, case-insensitive
strspn returns the length of the string in the string that matches the mask for the first time
strcspn returns the length of a string in the string that does not match the mask
string statistics
function detailed explanation
str_word_count statistics the number of words contained in a string
strlen statistics string length
count_chars statistics the number of times all letters appear in a string (0..255)
string encoding
function detailed explanation
md5 calculate the md5 hash value of a string
hash generate a hash code
create an array
function detailed explanation
array generate an array
array_combine generate an array, using the value of one array as the key name and the value of another array as the value
range creates and returns an array of elements with specified ranges
compact create an array of variables with parameters
array_fill fill the given value to generate an array
combination and splitting
function detailed explanation
array_chunk split an array into new array blocks
array_merge combine two or more arrays
array_slice take out a segment of the value in the array according to the conditions and return it.
array comparison
function detailed explanation
array_diff returns the difference array of two arrays
array_intersect returns an array of intersections of two or more arrays
array search replacement
function detailed explanation
array_search find a key value in an array
array_splice delete part of the array and replace other values
array_sum returns the sum of all values ​​in the array
in_array search for specified values ​​in arrays, case sensitive
array_key_exists determines whether the specified key exists in an array
array pointer operation
function detailed explanation
key returns the key name currently pointed to by the internal pointer of the array
current returns the current element in the array
next move the pointer to the current element to the next element position and return the value of the current element
prev move the pointer to the current element to the previous element position and return the value of the current element
end point the inner pointer of the array to the last element and return the value of that element (if successful)
reset point the inner pointer of the array to the first element and return the value of that element
list assign values ​​to a set of variables using elements in an array
array_shift delete the first element in the array and return the value of the deleted element
array_unshift insert one or more elements at the beginning of the array
array_push press one or more elements into the last array
array_pop delete the last element of the array
array key-value operation
function detailed explanation
shuffle breaking the array and keeping the key name
count calculate the number of units or object attributes in an array
array_flip returns an array after the key value is flipped
array_keys return all keys in the array to form an array
array_values return all values ​​in the array to form an array
array_reverse return an array of elements in the opposite order
array_count_values statistics the number of times all values ​​appear in the array
array_rand randomly extract one or more elements from the array, note that it is the key name
each return the current key/value pair in the array and move the array pointer one step forward
array_unique remove duplicate values ​​from the array
array sorting
function detailed explanation
sort sort arrays
rsort reverse sorting of arrays
asort sort the array and maintain index relationships
arsort reversely sort the array and maintain index relationships
ksort sort arrays by key names
krsort reversely sort the array by key name
natsort sort arrays using the "natural sort" algorithm
natcasesort use the "natural sorting" algorithm to sort the array case-insensitive letters
mathematical related
function detailed explanation
abs find the absolute value
ceil further method of sorting
floor leave the method of sorting
fmod returns the remainder of the floating point number of division
pow return to the n-power of the number
round floating point rounding method
sqrt find the square root
max find the maximum value
min find the minimum value
mt_rand better random numbers
rand random number
pi obtain pi
octdec convert octal to decimal
mysql related functions
function detailed explanation
mysql_affected_rows get the number of records affected by the previous mysql operation
mysql_client_encoding returns the name of the character set
mysql_close close mysql connection
mysql_connect open a connection to the mysql server
mysql_create_db create a new mysql database
mysql_data_seek move internal result pointer
mysql_db_name obtain result data
mysql_db_query send a mysql query
mysql_drop_db discard (delete) a mysql database
mysql_errno returns the numeric encoding of error messages in the previous mysql operation
mysql_error returns the text error message generated by the previous mysql operation
mysql_escape_string escape a string for mysql_query
mysql_fetch_array get a row from the result set as an associative array, or an array of numbers, or both
mysql_fetch_assoc get a row from the result set as an associative array
mysql_fetch_field get column information from the result set and return as an object
mysql_fetch_lengths get the length of each output in the result set
mysql_fetch_object get a row from the result set as an object
mysql_fetch_row get a row from the result set as an enumeration array
mysql_field_flags get flags associated with the specified field from the result
mysql_field_len returns the length of the specified field
mysql_field_name get the field name of the specified field in the result
mysql_field_seek set the pointer in the result set to the defined field offset
mysql_field_table get the table name where the specified field is located
mysql_field_type get the type of the specified field in the result set
mysql_free_result free result memory
mysql_get_client_info obtain mysql client information
mysql_get_host_info obtain mysql host information
mysql_get_proto_info obtain mysql protocol information
mysql_get_server_info obtain mysql server information
mysql_info get the latest query information
mysql_insert_id obtain the id generated by the previous insert operation
mysql_list_dbs list all databases in mysql server
mysql_list_fields list fields in mysql results
mysql_list_processes list mysql processes
mysql_list_tables list tables in mysql database
mysql_num_fields get the number of fields in the result set
mysql_num_rows get the number of rows in the result set
mysql_pconnect open a persistent connection to the mysql server
mysql_ping ping a server connection, if there is no connection, reconnect
mysql_query send a mysql query
mysql_real_escape_string escape special characters in strings used in sql statements and take into account the current character set of the concatenation
mysql_result obtain result data
mysql_select_db select mysql database
mysql_set_charset Sets the client character set
mysql_stat get the current system status
mysql_tablename obtain the table name
mysql_thread_id return the id of the current thread
mysql_unbuffered_query send a sql query to mysql, and rows that do not get and cache the result
file directory related
function detailed explanation
basename returns the file name part in the path
chgrp change the group to which the file belongs
chmod change file mode
chown change the owner of the file
clearstatcache clear file status cache
copy copy the file
delete see unlink or unset
dirname return to the directory part in the path
disk_free_space returns the available space in the directory
disk_total_space returns the total disk size of a directory
diskfreespace alias for disk_free_space
fclose close an open file pointer
feof test whether the file pointer reaches the end of the file
fflush output buffered content to file
fgetc read characters from file pointer
fgetcsv read a line from the file pointer and parse the csv field
fgets read a line from a file pointer
fgetss read a line from a file pointer and filter out html tags
file_exists check if the file or directory exists
file_get_contents read the entire file into a string
file_put_contents write a string to a file
file read the entire file into an array
fileatime get the last access time of the file
filectime get the inode modification time of the file
filegroup group of files obtained
fileinode get the inode of the file
filemtime get file modification time
fileowner obtain the owner of the document
fileperms obtain permissions to files
filesize get file size
filetype get file type
flock lightweight consultation file locking
fnmatch match file names with pattern
fopen open a file or url
fpassthru all remaining data at the output file pointer
fputcsv format the line to csv and write to the file pointer
fputs alias for fwrite
fread read files (safely used in binary files)
fscanf format input from a file
fseek positioning in file pointer
fstat get file information through the opened file pointer
ftell returns the location where the file pointer is read/write
ftruncate truncate the file to a given length
fwrite write to files (safely used in binary files)
glob find file paths that match patterns
is_dir determine whether the given file name is a directory
is_executable determine whether the given file name is executable
is_file determine whether the given file name is a normal file
is_link determine whether the given file name is a symbolic connection
is_readable determine whether the given file name is readable
is_uploaded_file determine whether the file is uploaded through http post
is_writable determine whether the given file name is writable
is_writeable is_writable alias
lchgrp Changes group ownership of symlink
lchown Changes user ownership of symlink
link create a hard connection
linkinfo get information about a connection
lstat give information about a file or symbol connection
md5_file calculate the md5 hash of the file
mkdir create a new directory
move_uploaded_file move uploaded files to a new location
parse_ini_file parse a configuration file
parse_ini_string Parse a configuration string
pathinfo returns the file path information
pclose close process file pointer
popen open process file pointer
readfile output a file
realpath_cache_get Get realpath cache entries
realpath_cache_size Get realpath cache size
realpath returns the normalized absolute path name
rename rename a file or directory
rewind rewind the file pointer position
rmdir delete directory
set_file_buffer alias for stream_set_write_buffer
stat give the information about the file
tempnam create a file with a unique file name
tmpfile create a temporary file
touch set file access and modification time
umask change the current umask
gd/image function
function detailed explanation
gd_info get information about the currently installed gd library
getimagesize get image size
getimagesizefromstring Get the size of an image from a string
image_type_to_extension get the file suffix of the image type
image_type_to_mime_type get the mime type of the image type returned by getimagesize, exif_read_data, exif_thumbnail, exif_imagetype
image2wbmp output images to browser or file in wbmp format
imagealphablending set the image color mixing mode
imageantialias whether to use antialias function
imagearc draw an elliptical arc
imagechar draw a character horizontally
imagecharup draw a character vertically
imagecolorallocate assign color to an image
imagecolorallocatealpha assign color to an image + alpha
imagecolorat get the color index value of a certain pixel
imagecolorclosest gets the index value of the color closest to the specified color
imagecolorclosestalpha get the color closest to the specified color plus transparency
imagecolorclosesthwb get the black and white index of the chromaticity closest to the given color
imagecolordeallocate cancel the image color assignment
imagecolorexact get the index value of the specified color
imagecolorexactalpha get the index value of the specified color plus transparency
imagecolormatch make the color of the palette version in an image better match the true color version
imagecolorresolve get the index value of the specified color or the closest alternative value that is possible
imagecolorresolvealpha get the index value of the specified color + alpha or the closest alternative value that is possible
imagecolorset set color for the specified palette index
imagecolorsforindex get the color of an index
imagecolorstotal get the number of colors in the palette of an image
imagecolortransparent define a color as transparent
imageconvolution use coefficients div and offset to apply for a 3x3 convolution matrix
imagecopy copy part of the image
imagecopymerge copy and merge part of the image
imagecopymergegray copy and merge part of the image in grayscale
imagecopyresampled resample and copy part of the image and resize it
imagecopyresized copy some images and resize them
imagecreate create a new palette-based image
imagecreatefromgd2 create a new image from a gd2 file or url
imagecreatefromgd2part create a new image from a part of the given gd2 file or url
imagecreatefromgd create a new image from a gd file or url
imagecreatefromgif create a new image from a file or url
imagecreatefromjpeg create a new image from a file or url
imagecreatefrompng create a new image from a file or url
imagecreatefromstring create a new image from the image stream in a string
imagecreatefromwbmp create a new image from a file or url
imagecreatefromxbm create a new image from a file or url
imagecreatefromxpm create a new image from a file or url
imagecreatetruecolor create a new true color image
imagedashedline draw a dotted line
imagedestroy destroy an image
imageellipse draw an ellipse
imagefill area filling
imagefilledarc draw an ellipse and fill it
imagefilledellipse draw an ellipse and fill it
imagefilledpolygon draw a polygon and fill it
imagefilledrectangle draw a rectangle and fill it
imagefilltoborder the area is filled to the boundary of the specified color
imagefilter use filters for images
imagefontheight get font height
imagefontwidth get font width
imageftbbox given a text box using freetype 2 font
imagefttext write text to images using freetype 2 font
imagegammacorrect apply gamma correction to gd images
imagegd2 output gd2 images to a browser or file
imagegd output gd images to browser or file
imagegif output image to browser or file
imagegrabscreen Captures the whole screen
imagegrabwindow Captures a window
imageinterlace activate or disable interlacing
imageistruecolor check if the image is true color image
imagejpeg output image to browser or file
imagelayereffect set the alpha color mixing logo to use the bound libgd layering effect
imageline draw a line segment
imageloadfont load a new font
imagepalettecopy copy the color palette from one image to another
imagepng output images to browser or file in png format
imagepolygon draw a polygon
imagepsbbox given a text box using postscript type1 font
imagepsencodefont change character encoding vector in font
imagepsextendfont extend or streamline fonts
imagepsfreefont free up a postscript type 1 font memory
imagepsloadfont load a postscript type 1 font from a file
imagepsslantfont tilt a certain font
imagepstext draw text strings on images using postscript type1 font
imagerectangle draw a rectangle
imagerotate rotate the image at a given angle
imagesavealpha set the marker to save the full alpha channel information when saving png images (as opposed to a single transparent hue)
imagesetbrush set the image of the brush for drawing lines
imagesetpixel draw a single pixel
imagesetstyle set the style of drawing lines
imagesetthickness set the width of the line drawing
imagesettile set the map for filling
imagestring draw a line of string horizontally
imagestringup draw a line of strings vertically
imagesx get image width
imagesy obtain image height
imagetruecolortopalette convert true color images to palette images
imagettfbbox get the range of text using truetype fonts
imagettftext write text to images using truetype font
imagetypes returns the image type supported by the current php version
imagewbmp output images to browser or file in wbmp format
imagexbm output xbm images to a browser or file
iptcembed embed binary iptc data into a jpeg image
iptcparse resolve binary iptc blocks at http://www.iptc.org/ to a single tag
jpeg2wbmp convert jpeg image files to wbmp image files
png2wbmp convert png image files to wbmp image files
session function
function detailed explanation
session_cache_expire return to the current cache expiration
session_cache_limiter get and set the current cache limit/gold
session_commit alias ​​for session_write_close
session_decode encode session data from a session-encoded string
session_destroy destroy all data registered to the session
session_encode encode the current session data into a string
session_id get and/or set the current session identifier
session_is_registered check if the variable is registered in the session
session_module_name obtain and/or set the current session module
session_name get and/or set the current session name
session_regenerate_id update the newly generated session identifier
session_register_shutdown session shutdown function
session_register register one or more global variables with the current session
session_save_path get and/or set the current session save path
session_set_save_handler set user-level session storage function
session_start start a new or resume an existing session
session_status return to the current session status
session_unregister log out of a global variable for the current session
session_unset free all session variables
session_write_close write session data and end session
cookie function
function detailed explanation
setcookie() set cookies
setrawcookie send cookies without url encoding
time and date function
function detailed explanation
checkdate verify a gregory date
date_add alias ​​datetime::add
date_create_from_format alias ​​datetime::createfromformat
date_create alias ​​datetime::__construct
date_date_set alias ​​datetime::setdate
date_default_timezone_get get the default time zone used by all date and time functions in a script
date_default_timezone_set set the default time zone for all date and time functions in a script
date_diff alias ​​datetime::diff
date_format alias ​​datetime::format
date_get_last_errors alias ​​datetime::getlasterrors
date_interval_create_from_date_string alias ​​dateinterval::createfromdatestring
date_interval_format alias ​​dateinterval::format
date_isodate_set alias ​​datetime::setisodate
date_modify alias ​​datetime::modify
date_offset_get alias ​​datetime::getoffset
date_parse_from_format Get info about given date formatted according to the specified format
date_parse Returns associative array with detailed info about given date
date_sub alias ​​datetime::sub
date_sun_info Returns an array with information about sunset/sunrise and twilight begin/end
date_sunrise returns the given date and place of sunrise time
date_sunset returns the given date and place of sunset time
date_time_set alias ​​datetime::settime
date_timestamp_get alias ​​datetime::gettimestamp
date_timestamp_set alias ​​datetime::settimestamp
date_timezone_get alias ​​datetime::gettimezone
date_timezone_set alias ​​datetime::settimezone
date format a local time/date
getdate obtain date/time information
gettimeofday get the current time
gmdate format a gmt/utc date/time
gmmktime get the unix timestamp of the gmt date
gmstrftime format gmt/utc time/date according to locale settings
idate format local time dates as integers
localtime get local time
microtime returns the current unix timestamp and microsecond count
mktime get a unix timestamp for a date
strftime format local time/date according to locale settings
strptime parses the date/time generated by strftime
strtotime parses the date-time description of any english text to a unix time stamp
time return the current unix timestamp
timezone_abbreviations_list alias ​​datetimezone::listabbreviations
timezone_identifiers_list alias ​​datetimezone::listidentifiers
timezone_location_get alias ​​datetimezone::getlocation
timezone_name_from_abbr Returns the timezone name from abbreviation
timezone_name_get alias ​​datetimezone::getname
timezone_offset_get alias ​​datetimezone::getoffset
timezone_open alias ​​datetimezone::__construct
timezone_transitions_get alias ​​datetimezone::gettransitions
timezone_version_get Gets the version of the timezonedb

PHP function reference table Introduction

about php programming introduction:

1. php: an open source server-side scripting language, especially suitable for web development and can be used in html.

2. php is one of the earliest server-side scripting languages. since its establishment by rasmus lerdorf in 1995, php has become one of the widely used programming languages ​​around the world.

3. php provides a large number of built-in functions, which cover all aspects from string processing to file system operations, database interaction, network communication, etc.

4. proficient in mastering the built-in functions in php, you can quickly get started with php programming, and save a lot of development time and costs.

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