Table of Contents addcslashes -- Quote string with slashes in a C styleaddslashes -- Quote string with slashesbin2hex --  Convert binary data into hexadecimal representationchop -- Alias of rtrim() chr -- Return a specific characterchunk_split -- Split a string into smaller chunksconvert_cyr_string --  Convert from one Cyrillic character set to anothercount_chars --  Return information about characters used in a stringcrc32 -- Calculates the crc32 polynomial of a stringcrypt -- One-way string encryption (hashing)echo -- Output one or more stringsexplode -- Split a string by stringfprintf -- Write a formatted string to a streamget_html_translation_table --  Returns the translation table used by htmlspecialchars() and htmlentities()hebrev --  Convert logical Hebrew text to visual texthebrevc --  Convert logical Hebrew text to visual text with newline conversionhtml_entity_decode --  Convert all HTML entities to their applicable charactershtmlentities --  Convert all applicable characters to HTML entitieshtmlspecialchars --  Convert special characters to HTML entitiesimplode -- Join array elements with a stringjoin -- Alias of implode() levenshtein --  Calculate Levenshtein distance between two stringslocaleconv -- Get numeric formatting informationltrim --  Strip whitespace from the beginning of a stringmd5_file -- Calculates the md5 hash of a given filenamemd5 -- Calculate the md5 hash of a stringmetaphone -- Calculate the metaphone key of a stringmoney_format -- Formats a number as a currency stringnl_langinfo --  Query language and locale informationnl2br --  Inserts HTML line breaks before all newlines in a stringnumber_format -- Format a number with grouped thousandsord -- Return ASCII value of characterparse_str -- Parses the string into variablesprint -- Output a stringprintf -- Output a formatted stringquoted_printable_decode --  Convert a quoted-printable string to an 8 bit stringquotemeta -- Quote meta charactersrtrim --  Strip whitespace from the end of a stringsetlocale -- Set locale informationsha1_file -- Calculate the sha1 hash of a filesha1 -- Calculate the sha1 hash of a stringsimilar_text --  Calculate the similarity between two stringssoundex -- Calculate the soundex key of a stringsprintf -- Return a formatted stringsscanf --  Parses input from a string according to a formatstr_ireplace --  Case-insensitive version of str_replace().str_pad --  Pad a string to a certain length with another stringstr_repeat -- Repeat a stringstr_replace --  Replace all occurrences of the search string with the replacement stringstr_rot13 -- Perform the rot13 transform on a stringstr_shuffle -- Randomly shuffles a stringstr_split --  Convert a string to an arraystr_word_count --  Return information about words used in a stringstrcasecmp --  Binary safe case-insensitive string comparisonstrchr -- Alias of strstr() strcmp -- Binary safe string comparisonstrcoll -- Locale based string comparisonstrcspn --  Find length of initial segment not matching maskstrip_tags -- Strip HTML and PHP tags from a stringstripcslashes --  Un-quote string quoted with addcslashes()stripos --  Find position of first occurrence of a case-insensitive stringstripslashes --  Un-quote string quoted with addslashes()stristr --  Case-insensitive strstr()strlen -- Get string lengthstrnatcasecmp --  Case insensitive string comparisons using a "natural order" algorithmstrnatcmp --  String comparisons using a "natural order" algorithmstrncasecmp --  Binary safe case-insensitive string comparison of the first n charactersstrncmp --  Binary safe string comparison of the first n charactersstrpos --  Find position of first occurrence of a stringstrrchr --  Find the last occurrence of a character in a stringstrrev -- Reverse a stringstrripos --  Find position of last occurrence of a case-insensitive string in a stringstrrpos --  Find position of last occurrence of a char in a stringstrspn --  Find length of initial segment matching maskstrstr -- Find first occurrence of a stringstrtok -- Tokenize stringstrtolower -- Make a string lowercasestrtoupper -- Make a string uppercasestrtr -- Translate certain characterssubstr_compare --  Binary safe optionally case insensitive comparison of 2 strings from an offset, up to length characterssubstr_count -- Count the number of substring occurrencessubstr_replace -- Replace text within a portion of a stringsubstr -- Return part of a stringtrim --  Strip whitespace from the beginning and end of a stringucfirst -- Make a string's first character uppercaseucwords --  Uppercase the first character of each word in a stringvprintf -- Output a formatted stringvsprintf -- Return a formatted stringwordwrap --  Wraps a string to a given number of characters using a string break character.