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    <p>Others have already answered the question well. I only want to give some other examples, you should be aware of, all are caused by PHP's type juggling. All the following comparisons will return <strong>true</strong>:</p> <ul> <li>'abc' == 0</li> <li>0 == null</li> <li>'' == null</li> <li>1 == '1y?z'</li> </ul> <p>Because i found this behaviour dangerous, i wrote my own equal method and use it in my projects:</p> <pre><code>/** * Checks if two values are equal. In contrast to the == operator, * the values are considered different, if: * - one value is null and the other not, or * - one value is an empty string and the other not * This helps avoid strange behavier with PHP's type juggling, * all these expressions would return true: * 'abc' == 0; 0 == null; '' == null; 1 == '1y?z'; * @param mixed $value1 * @param mixed $value2 * @return boolean True if values are equal, otherwise false. */ function sto_equals($value1, $value2) { // identical in value and type if ($value1 === $value2) $result = true; // one is null, the other not else if (is_null($value1) || is_null($value2)) $result = false; // one is an empty string, the other not else if (($value1 === '') || ($value2 === '')) $result = false; // identical in value and different in type else { $result = ($value1 == $value2); // test for wrong implicit string conversion, when comparing a // string with a numeric type. only accept valid numeric strings. if ($result) { $isNumericType1 = is_int($value1) || is_float($value1); $isNumericType2 = is_int($value2) || is_float($value2); $isStringType1 = is_string($value1); $isStringType2 = is_string($value2); if ($isNumericType1 &amp;&amp; $isStringType2) $result = is_numeric($value2); else if ($isNumericType2 &amp;&amp; $isStringType1) $result = is_numeric($value1); } } return $result; } </code></pre> <p>Hope this helps somebody making his application more solid, the original article can be found here: <a href="http://www.martinstoeckli.ch/php/php.html#equal" rel="nofollow">Equal or not equal</a></p>
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    1. POWhy does (0 == 'Hello') return true in PHP?
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    1. COWhile not reading the code, what is the advantage of your function towards the `===` operator?
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    2. COIt's the same advantage you have, using the == operator, you can compare two variables even if they have different types. PHP doesn't support you well with controlling types explicitly and often a function doesn't know if the paramater passed in, is a number `8` or a user input `'8'`. Then you are glad when you can compare them anyway. Otherwise you would have to write code for all possible types in the function itself.
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