Check if a string contains a word

How do I check if a string contains a specific word?

$a = 'Hello world?';

if (strpos($a, 'Hello') !== false) { //PAY ATTENTION TO !==, not !=
    echo 'true';
}
if (stripos($a, 'HELLO') !== false) { //Case insensitive
    echo 'true';
}

Source: stackoverflow.com

If word exist in string

$a = 'How are you?';

if (strpos($a, 'are') !== false) {
    echo 'true';
}

Source: stackoverflow.com

Check if a string contains a word

//By far the most accurate: VIA https://stackoverflow.com/a/25633879/7596555
function containsWord($str, $word)
{
    return !!preg_match('#\\b' . preg_quote($word, '#') . '\\b#i', $str);
}

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