Summary of commonly used string functions in PHP

PHP's self-contained string functions, date functions, array functions, and so on, can sometimes help us solve very complex problems, the use is relatively simple.

The following summarizes the commonly used string functions.

Addcslashes-adds a backslash escape character for some characters inside a string

addslashes-characters inside a string are escaped in the specified manner

bin2hex-converts binary data to hexadecimal notation

alias function for Chop-rtrim ()

chr-returns the ASCII code of a character

Chunk_split-divide a string into small pieces at a certain length of character

Convert_cyr_string-converting Slavic characters to other characters

convert_uudecode-decrypting a string

convert_uuencode-Encrypt a string

count_chars-returns the character usage information for a string

crc32-computes a crc32 polynomial of a string

crypt-one-way hash encryption function

Echo-used to display some content

Explode-converts a string into an array form with a separator

fprintf-returns data as required and writes directly to the document stream

Get_html_translation_table-returning HTML entities that can be converted

hebrev-converting Hebrew encoded strings to visual text

hebrevc-converting Hebrew encoded strings to visual text

Inverse of the html_entity_decode-htmlentities () function to convert HTML entities to characters

htmlentities-convert some characters in a string to HTML entities

Inverse of the htmlspecialchars_decode-htmlspecialchars () function to convert HTML entities to characters

htmlspecialchars-convert some characters in a string to HTML entities

implode-to convert an array to a string with a specific separator character

join-convert an array to a string, alias of the Implode () function

levenshtein-Calculate the difference size of two words

localeconv-getting a number-related format definition

ltrim-to remove whitespace to the left of a string or to a specified character

md5_file-a file for MD5 algorithm encryption

md5-a string for MD5 algorithm encryption

Metaphone-judging the pronunciation rules of a string

money_format-output of numbers formatted according to parameters

nl_langinfo-querying language and local information

nl2br-replacing the newline character "\ n" in a string with "<br/>"

number_format-output of numbers formatted according to parameters

ord-converts an ASCII code to one character

parse_str-Convert a string of a certain format into a variable and a value

Print-used to output a single value

printf-data Display as required

Quoted_printable_decode-to encrypt a string into a 8-bit binary string

Quotemeta-to escape a number of specific characters

rtrim-remove whitespace to the right of a string or a specified character

setlocale-setting local formats for numbers, dates, and so on

sha1_file-a file for SHA1 algorithm encryption

Sha1-a string for SHA1 algorithm encryption

Similar_text-compares two strings and returns the number of similar characters that the system thinks

Soundex-judging the pronunciation rules of a string

The sprintf-returns the data as required, but does not output

sscanf-can format a string

str_ireplace-matches and replaces strings like the Str_replace () function, but is case insensitive

str_pad-padding on both sides of a string

str_repeat-repeating combinations of strings

str_replace-matching and replacing strings

str_rot13-string for ROT13 encryption processing

str_shuffle-random ordering of characters inside a string

str_split-splits a string into an array by character spacing

str_word_count-get the English word information inside the string

strcasecmp-size comparison of strings, case insensitive

Strchr-the alias of a partial strstr () function that returns a string by comparison

strcmp-size comparison of strings

strcoll– size comparison of strings based on local settings

strcspn-returns the value of a continuous non-matching length of characters

strip_tags-remove HTML and PHP code from a string

stripcslashes-inverse literal addcslashes () function escapes processed strings

Stripos-finds and returns the position of the first occurrence, matching is case-insensitive

stripslashes-inverse literal addslashes () function escapes processed strings

stristr-returns a portion of a string by comparison, case-insensitive compared

Strlen-gets the encoded length of a string

strnatcasecmp-the size comparison of strings using natural sorting, case-insensitive

strnatcmp-the size comparison of strings using the natural sort method

strncasecmp-size comparison of the first n characters of a string, case insensitive

strncmp-size comparison of the first n characters of a string

strpbrk-returns a portion of a string by comparison

strpos-Find and return the position of the first occurrence

strrchr-returns a part of a string by comparing it from backward to forward

strrev-all letters inside the string in reverse order

Strripos-finds and returns the position of the first match from the back, matching is case insensitive

strrpos– Find and return the position of the first match from behind

strspn-matches and returns the value of the character continuous occurrence length

strstr-returns a portion of a string by comparison

strtok-to split a string with a specified number of characters

strtolower-converting a string to lowercase

strtoupper– converting a string to uppercase

strtr-to string comparison substitution

Substr_compare-Comparison of strings after interception

substr_count-count occurrences of a character segment in a string

substr_replace-to replace part of a character in a string

substr-to intercept a string

trim-remove whitespace or specified characters on either side of a string

Ucfirst-converts the first letter of a given string to uppercase

ucwords-the first letter of each English word of the given string into uppercase

vfprintf-returns data as required and writes directly to the document stream

vprintf-data Display as required

The vsprintf-returns the data as required, but does not output

wordwrap-to divide a string by a certain character length

Summary of commonly used string functions in PHP