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Difference between == and === ?

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May 11.2005

What’s the difference between == and === ?
and
What’s the difference between != and !== ?

And why would I use one instead of the other?

to post a comment
PHP

5 Comments(s) ↴

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@ShrineDesignsMay 11.2005 — == equal to

!= not equal to

=== identical to

!== not identical to

the difference, == test if the equation on the left and right are equal to one another even if they are of different types, whereas, === check if they are identical both value and type
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@bokehauthorMay 11.2005 — Do you mean like this:
[code=php]
if(1+2 == 3) { //TRUE
}
if(1+2 === 3) { //FALSE
}
[/code]
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@felgallMay 11.2005 — They would both be true because they are all numbers and equal/identical values.

It gives different results when the two sides are different types eg numeric and boolean for example:
if(12 == true) { //TRUE because only 0 evaluates as false
}
if(12 === true) { //FALSE because they are not the same type
}
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@ShrineDesignsMay 11.2005 — more like[code=php]<?php
if(1 == true)
{
echo '1 is equal to true<br>';
}
if(1 === true)
{
echo '1 is identical to true<br>';
}
if(1 != true)
{
echo '1 not is not equal to true<br>';
}
if(1 !== true)
{
echo '1 is not identical to true<br>';
}
?>[/code]
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@JonaMay 13.2005 — [font=Trebuchet MS]For the record, this is true of PHP and other languages with similar syntax (including JavaScript).[/font]
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