Summary of php5 string processing functions

This article introduces the common string processing functions in php5, including string comparison, string search, string interception and other functions. Friends in need can refer to it.

A summary of php5 string processing functions, friends who use php programming can use it as a reference.

PHP commonly used string processing functions (string comparison, string search, string interception, etc.) are as follows: addcslashes — Add backslash escape characters to some characters in a string addslashes — Escape characters in a string in a specified way bin2hex — Convert binary data to hexadecimal representation chop — alias function for rtrim() chr — Returns the ascii code of a character chunk_split — Split a string into small chunks according to a certain character length convert_cyr_string — Convert Cyrillic characters to other characters convert_uudecode — Decrypt a string convert_uuencode — Encrypt a string count_chars — Returns character usage information in a string crc32 — Compute the crc32 polynomial of a string crypt — One-way hash encryption function echo — used to display something explode — Convert a string into an array using delimiters fprintf — Return data as required and write directly to the document stream get_html_translation_table — Returns html entities that can be translated hebrev — Convert a hebrew-encoded string to visual text hebrevc — Convert hebrew-encoded strings to visual text html_entity_decode — The inverse function of htmlentities () function, converts html entities into characters htmlentities — Convert some characters in a string to html entities htmlspecialchars_decode — The inverse function of htmlspecialchars() function, converts html entities into characters htmlspecialchars — Convert some characters in a string to html entities implode — Convert an array into a string using a specific delimiter join — Convert an array to a string, alias of implode() function levenshtein — calculate the difference between two words localeconv — Get number-related format definitions ltrim — removes whitespace or specified characters from the left side of a string md5_file — Encrypt a file using the md5 algorithm md5 — Encrypt a string with the md5 algorithm metaphone — determine the pronunciation rules of a string money_format — Output of numbers formatted according to arguments nl_langinfo — Query language and locale information nl2br — Replace newline character "n" in a string with "
" number_format — Output of numbers formatted according to arguments ord — Convert an ascii code to a character parse_str — Convert strings in a certain format into variables and values print — used to print a single value printf — display data as required quoted_printable_decode — Encrypt a string into an 8-bit binary string quotemeta — escape several specific characters rtrim — removes whitespace or specified characters from the right side of a string setlocale — Set local formatting for numbers, dates, etc. sha1_file — Encrypt a file using the sha1 algorithm sha1 — Encrypt a string using the sha1 algorithm similar_text — Compares two strings and returns the number of similar characters that the system considers soundex — Determine the pronunciation rules of a string sprintf — returns data as required, but does not output it sscanf — can format strings 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 — Repeat combinations of strings str_replace — match and replace strings str_rot13 — Encrypt a string with rot13 str_shuffle — Randomly sort the characters in a string str_split — Split a string into an array based on character spacing str_word_count — Get the English word information in the string strcasecmp — compare strings, case-insensitively strchr — Alias ​​for the strstr() function that returns a portion of a string by comparison strcmp — Compare string sizes strcoll – size comparison of strings based on local settings strcspn — Returns the length of consecutive non-matching characters strip_tags — remove html and php code from a string stripcslashes — Unescaping strings processed by the addcslashes() function stripos — Find and return the position of the first match, matches are not case-sensitive stripslashes — Unescaping strings processed by the addslashes() function stristr — Returns parts of a string by comparison, case-insensitive comparisons strlen — Get the encoded length of a string strnatcasecmp — Compare strings using natural ordering, case-insensitively strnatcmp — compare strings using natural ordering. strncasecmp — Compares the first n characters of a string, case-insensitively strncmp — compare the size of the first n characters of a string strpbrk — Return parts of a string by comparison strpos — Find and return the position of the first match strrchr — Return a portion of a string by comparing it backwards and forwards strrev — Reverse all letters in a string strripos — searches backward and returns the position of the first match, matching is not case-sensitive strrpos – searches backward and returns the position of the first match strspn — Match and return the length of consecutive occurrences of a character strstr — Returns parts of a string by comparison strtok — Split a string by a specified number of characters strtolower — Convert a string to lowercase strtoupper – Convert a string to uppercase strtr — compare and replace strings substr_compare — compare truncated strings substr_count — Count the number of occurrences of a certain character segment in a string substr_replace — Replace some characters in a string substr — intercept a string trim — remove whitespace or specified characters from both sides of a string ucfirst — Convert the first letter of the given string to uppercase ucwords — Capitalize the first letter of each English word in the given string vfprintf — Return data as required and write directly to the document stream vprintf — display data as required vsprintf — Returns data as required, but does not output it wordwrap — Split a string according to a certain character length The strtolower() function converts all characters to lowercase, the strtoupper() function converts all characters to uppercase, the ucfirst() function converts the first letter of the given string to uppercase, and the ucwords() function converts the first letter of the given string to uppercase. The first letter of every English word becomes capitalized. ucfirst() only processes the first character of the string, and ucwords() only processes the first letter of each word (use spaces to determine whether it is a word, "today! hi" and "today.hi" will be considered one word) , the case status of the remaining letters does not change.Example of php space-separated text into array A simple example of splitting a Chinese string into an array in php Several ways to split Chinese and English strings in php php split() string splitting function application example Solution to php splitting GBK Chinese garbled characters Example of php string splitting function explode Detailed explanation of PHP string comparison and search methods PHP function usage reference for comparing string similarity Introduction to the usage of PHP string comparison functions strcmp() and strcasecmp() PHP example code for comparing string similarity