The 3 different equals

php comparison operators
Strawberry picture Strawberry · Jan 14, 2010 · Viewed 46.4k times · Source

What is the difference between =, ==, and ===?

I think using one equal sign is to declare a variable while two equal signs are for a comparison condition and lastly three equal signs are for comparing values of declared variables.

Answer

gnarf picture gnarf · Jan 14, 2010

You have = the assignment operator, == the 'equal' comparison operator and === the 'identical' comparison operator.

$a = $b     Assign      Sets $a to be equal to $b.
$a == $b    Equal       TRUE if $a is equal to $b.
$a === $b   Identical   TRUE if $a is equal to $b, and they are of the same type. (introduced in PHP 4)

For more info on the need for == and ===, and situations to use each, look at the docs.

Related questions

php == vs === operator

What is the difference between == and === in PHP? What would be some useful examples? Additionally, how are these operators used in JavaScript? Are they related to PHP?

Read More
"Begins with" in Twig template

I have a twig template where I would like to test if an item begins with a certain value {% if item.ContentTypeId == '0x0120' %} <td><a href='?parentId={{ item.Id }}'>{{ item.BaseName }}</…

Read More
Eclipse PDT vs. NetBeans for PHP development

How does Eclipse PDT compare to NetBeans for PHP development? I just bought a new computer with Windows 7 and I'm starting to set up a development environment for PHP. Has anyone used both IDEs lately and could make a quick …

Read More