3 equal signs ??

mikerh9

Why 3 equal signs is used here instead of 2?

http://us2.php.net/manual/en/function.fwrite.php
// Write $somecontent to our opened file.
if (fwrite($handle, $somecontent) === FALSE) {
echo "Cannot write to file ($filename)";
exit;
}

LordShryku

It's a strict comparison. False on a non strict comparison(two equal signs) can also be 0, NULL, blank, etc.
http://www.php.net/manual/en/language.operators.comparison.php

# Example
1 == 1 # true
1 == "1" # true
1 === 1 # true
1 === "1" # false

Mordecai

It is commonly used to check if something is a reference of something else. It checks whether they are of the same value and the same data type. In Shryku's example above, 1 === "1" was false because the left side is an integer, but the right side is a string. It is true with two equals because they have the same value.