What are the implications of using strpos() in PHP code for checking substring existence?

Using strpos() to check for substring existence in PHP code can lead to potential issues if the substring is found at the beginning of the string, as it returns a position (0) that can be interpreted as false in a conditional check. To solve this issue, you should use the strict comparison operator (===) to check if the substring position is not equal to false. 

$string = "Hello, World!";
$substring = "Hello";

if(strpos($string, $substring) !== false) {
    echo "Substring found!";
} else {
    echo "Substring not found.";
}

Keywords

strpos PHP substring existence implications

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