What is the purpose of using strpos in PHP and how does it work?

The purpose of using strpos in PHP is to find the position of the first occurrence of a substring within a string. It returns the position as an integer, or false if the substring is not found. This function is useful for searching for specific characters or words within a larger string. 

// Example of using strpos to find the position of a substring within a string
$string = "Hello, world!";
$substring = "world";

$pos = strpos($string, $substring);

if ($pos !== false) {
    echo "The substring '$substring' was found at position $pos.";
} else {
    echo "The substring '$substring' was not found.";
}

Keywords

strpos PHP string function position

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