Question

How to replace the first occurrence of a substring in a string with PHP

Answer 1

function replaceFirst($input, $search, $replace) {
    $index = strpos($input, $search);
    
    if ($index === false) return $input;
    
    return substr($input, 0, $index) . $replace . substr($input, $index + strlen($search));
}

$s = "aa bb cc dd ee cc";
$result = replaceFirst($s, "cc", "YY");

echo $result;



/*
run:

aa bb YY dd ee cc

*/

 

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