What potential issue could arise when using substr_count with escape sequences like %0A in PHP?

When using substr_count with escape sequences like %0A in PHP, the potential issue that could arise is that the function may not correctly count the occurrences of the escape sequence due to URL decoding. To solve this issue, you can first decode the escape sequences using urldecode before using substr_count. 

$string = "Hello%0AWorld%0A%0A";
$escapedSequence = "%0A";
$decodedSequence = urldecode($escapedSequence);

$count = substr_count(urldecode($string), $decodedSequence);

echo $count; // Output: 3

Keywords

substr_count escape sequences %0A PHP potential issue

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