(PHP 4 >= 4.1.0, PHP 5, PHP 7) Output a formatted string

(PHP 4, PHP 5, PHP 7) Strip whitespace (or other characters) from the beginning of a string

(PHP 5, PHP 7) Case-insensitive version of

(PHP 4, PHP 5, PHP 7) Calculate the soundex key of a string

(PHP 4, PHP 5, PHP 7) Replace text within a portion of a string

(PHP 4, PHP 5, PHP 7) Binary safe string comparison of the first n characters

(PHP 4, PHP 5, PHP 7) Convert special characters to HTML entities

(PHP 4 >= 4.3.0, PHP 5, PHP 7) Convert all HTML entities to their applicable characters

(PHP 4, PHP 5, PHP 7) Inserts HTML line breaks before all newlines in a string

(PHP 4, PHP 5, PHP 7) Un-quote string quoted with