String

Returns a string with backslashes before characters that need to be quoted in database queries etc.

Returns an ASCII string containing the hexadecimal representation of $str. The conversion is done byte-wise with the high-nibble first.

Returns a one-character string containing the character specified by $ascii.

chunk_split() inserts $end every $chunklen characters in $body.

Counts the number of occurrences of every byte-value (0..255) in $string and returns it in various ways.

Returns an array of strings, each of which is a substring of $string formed by splitting it on boundaries formed by the string $delimiter.

html_entity_decode() is the opposite of htmlentities() in that it converts all HTML entities to their applicable characters from $string.

This function is identical to htmlspecialchars() in all ways, except with htmlentities(), all characters which have HTML character entity equivalents are translated into these entities.

Certain characters have special significance in HTML, and should be represented by HTML entities if they are to preserve their meanings.

Join array elements with a string.

The Levenshtein distance is defined as the minimal number of characters you have to replace, insert or delete to transform $str1 into $str2.

Returns the ASCII value of the first character of string.

Parses $str as if it were the query string passed via a URL and sets variables in the current scope.

similar_text calculate the similarity between two strings.

This functions returns the $input string padded on the left, the right, or both sides to the specified padding length.

This function returns a string or an array with all occurrences of $search in $subject replaced with the given $replace value.

str_rot13() performs the ROT13 encoding on the $str argument and returns the resulting string.

Returns the numeric position of the first occurrence of $needle in the $haystack string.

Returns all of $haystack from the first occurrence of $needle to the end. The search is not case sensitive.

The function strlen() returns the length of the given $string.

This function is similar to strcmp(), with the difference that you can specify the (upper limit of the) number of characters from each string to be used in the comparison.

Returns the numeric position of the first occurrence of $needle in the $haystack string.

Find position of last occurrence of $needle in the case-insensitive string $haystack.

Returns the numeric position of the last occurrence of $needle in the $haystack string.

Returns part of $haystack string from the first occurrence of $needle to the end of $haystack.

Returns $str with all alphabetic characters converted to lowercase.

Returns $str with all alphabetic characters converted to uppercase.

This function returns a copy of $str, translating all occurrences of each character in $from to the corresponding character in $to.

Returns the portion of string specified by the $start and $length parameters.

substr_count() returns the number of times the $needle substring occurs in the $haystack string.

This function returns a string with whitespace stripped from the beginning and end of $str.

Returns a string with the first character of $str capitalized, if that character is alphabetic.

Returns a string with the first character of each word in $str capitalized, if that character is alphabetic.

Wraps a string to a given number of characters using a string break character.