Web Reference: If length is given and is positive, the string returned will contain at most length characters beginning from offset (depending on the length of string). If length is given and is negative, then that many characters will be omitted from the end of string. Specifies the string to return a part of. Required. Specifies where to start in the string. Optional. Specifies the length of the returned string. Default is to the end of the string. PHP 7.0 - If string = start (in characters long), it will return an empty string. Earlier versions returns FALSE. Jul 23, 2025 · The substr () function is used to extract a substring from a string in PHP. It takes three arguments: the input string, the starting position (zero-based index), and optionally the length of the substring to extract.
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