Below are some common and useful PHP string functions.
PHP check if string is empty
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if ($str !== '') { // $str is empty } |
PHP string split by character
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$array = explode("delimiter", $str); |
PHP check if string contains
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if (strpos($str, 'keyword') !== false) { // $str contains 'keyword' } |
PHP check string length
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strlen($str) |
PHP replace part of a string
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$str = str_replace('old', 'new', $str); |
PHP get substring of a string
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substr($str,$start,$length); // skip first n chars substr($str,n); // get last n chars substr($str,-n); // get n to n+length chars substr($str,n, length); |
PHP insert insert a string into another string at position
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// insert $new string into $string at position 4 $string = replace($string, $new, 4, 0); |
PHP trim spaces
Trim leading and trailing spaces from a string
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trim($str); |