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Assuming very easy question

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Basically, if you use the assignment operator =, the left-hand argument and the right-hand argument are evaluated, right is assigned to left and the boolean true is returned. So, checking if( $a = 5 ) { ... } is the same as checking if( true ) { ... } which is always run by PHP.

The two equality operators (== and ===) compare the arguments for, well, equality and return true or false, based on the comparison.

You should use the strict equality operator === over the normal equality operator ==, because the normal equality operator will attempt type conversion.

Checking if( "" == false ) { ... } would have the statement become true, so the code will be run, whereas checking if( "" === false ) { ... } will not have the code being run, as no type conversion is performed.

Hope this helped a bit.

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