Useful String Functions

Can be found at: PHP Manual -- String Functions

addslashes -- Adds escape slashes to a string



stripslashes --  Removes escape slashes from a string



bin2hex --  Converts binary data into hexadecimal



chr -- Returns a specific character (i.e., 65 = "A") 



ord -- Returns ASCII value of character (i.e., "A" = 65) 



count_chars --  Returns an array with what ASCII characters were found in a string



echo -- Outputs strings to the screen



print -- Outputs a string to the screen



printf -- Outputs a formatted string



sprintf -- Returns a formatted string



explode -- Splits a string into an array using a delimiter



implode -- Joins array elements into a single string



join -- Alias of implode()



fprintf -- Writes a formatted string to a stream



htmlentities --  Converts all applicable characters to HTML entities



html_entity_decode --  Converts all HTML entities to their applicable characters



htmlspecialchars --  Converts special characters to HTML entities



htmlspecialchars_decode --  Converts special HTML entities back to characters



levenshtein --  Calculates the Levenshtein distance between two strings



metaphone -- Calculate the metaphone key of a string



similar_text --  Calculate the similarity between two strings



soundex -- Calculate the soundex key of a string



localeconv -- Get local numeric formatting information



trim -- Strips whitespace (or other characters) from the beginning and end of a string



ltrim --  Strips whitespace (or other characters) from the beginning of a string



rtrim --  Stris whitespace (or other characters) from the end of a string



chop -- Alias of rtrim()



md5_file -- Calculates the md5 hash of a given file



md5 -- Calculates the md5 hash of a string



crypt -- One-way string encryption (i.e., hashing)



money_format -- Formats a number as a currency string



nl2br --  Inserts HTML line breaks (i.e., <br>) before all newlines in a string



number_format -- Format a number with grouped thousands



parse_str -- Parses the string into variables



setlocale -- Sets locale information



str_getcsv --  Parses a CSV string into an array



str_pad --  Pads a string to a certain length with another string



str_repeat -- Repeats a string



str_replace --  Replaces all occurrences of the search string with the replacement string



str_ireplace --  Case-insensitive version of str_replace().



str_rot13 -- Performs the rot13 transform on a string



str_shuffle -- Randomly shuffles a string



str_split --  Converts a string to an array



str_word_count --  Returns information about words used in a string



strcasecmp --  Binary safe case-insensitive string comparison



strchr -- Alias of strstr()



strcmp -- Binary safe string comparison



strcoll -- Locale based string comparison



strcspn --  Find length of initial segment not matching mask



strip_tags -- Strip HTML and PHP tags from a string



stripcslashes --  Un-quote string quoted with addcslashes()



stripos --  Finds position of first occurrence of a case-insensitive string



stristr --  Case-insensitive strstr()



strlen -- Get string length



strnatcasecmp --  Case insensitive string comparisons using a "natural order" algorithm



strnatcmp --  String comparisons using a "natural order" algorithm



strncasecmp --  Binary safe case-insensitive string comparison of the first n characters



strncmp --  Binary safe string comparison of the first n characters



strpbrk --  Searches a string for any of a set of characters



strpos --  Finds position of first occurrence of a string



strrchr --  Finds the last occurrence of a character in a string



strrev -- Reverses a string



strripos --  Finds position of last occurrence of a case-insensitive string in a string



strrpos --  Finds position of last occurrence of a char in a string



strspn --  Finds length of initial segment matching mask



strstr -- Finds first occurrence of a string



strtok -- Tokenizes string



strtolower -- Makes a string lowercase



strtoupper -- Makes a string uppercase



strtr -- Translatse certain characters



substr_compare --  Binary safe optionally case insensitive comparison of 2 strings from an offset, up to length characters



substr_count -- Counts the number of substring occurrences



substr_replace -- Replaces text within a portion of a string



substr -- Returns part of a string



ucfirst -- Make a string's first character uppercase



ucwords --  Uppercase the first character of each word in a string



wordwrap --  Wraps a string to a given number of characters using a string break character