check if a substring exists in string php

PHP
$a = 'How are you?';

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

if ($result != false)
{
  // text found
}$a = 'How are you?';

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

Source

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