What is the difference between == and === in php. I am unsure when to use both.

Updated note: So that it shows up in StackOverflow search, the difference between == and === is the same as the difference between != and !==.

Accepted Answer

The operator == casts between two different types if they are different, while the === operator performs a 'typesafe comparison'. That means that it will only return true if both operands have the same type and the same value.

Examples:

1 === 1: true
1 == 1: true
1 === "1": false // 1 is an integer, "1" is a string
1 == "1": true // "1" gets casted to an integer, which is 1
"foo" === "foo": true // both operands are strings and have the same value
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