Web Reference: If offset denotes the position of this truncation or beyond, an empty string will be returned. If length is given and is 0, an empty string will be returned. If length is omitted or null, the substring starting from offset until the end of the string will be returned. Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, Python, PHP, Bootstrap, Java, XML and more. 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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