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PHP has ten built in comparison operators:
| Name | Example | Result |
|---|---|---|
| Equal | $a == $b |
true if $a is equal to $b after type juggling. |
| Identical | $a === $b |
true if $a is equal to $b and the same type. |
| Not Equal | $a != $b |
true if $a is not equal to $b after type juggling. |
| Not Equal | $a <> $b |
true if $a is not equal to $b after type juggling. |
| Not identical | $a !== $b |
true if $a is not equal to $b or not of the same type. |
| Less than | $a < $b |
true if $a is strictly less than $b. |
| Greater than | $a > $b |
true if $a is strictly greater than $b. |
| Less than or equal to | $a <= $b |
true if $a is less than or equal to $b. |
| Greater than or equal to | $a >= $b |
true if $a is greater than or equal to $b. |
| Spaceship | $a <=> $b |
returns an integer less than, equal to, or greater than 0i when $a. |
PHP has distinct definitions that differentiate between equal and identical.
Sometimes identical is also referred to as strictly equal.
<?php
// Comparisons between integer and numeric string values
1 == "1"; // => true, equal
1 === "1"; // => false, not identical
// Comparisons between integers and floating point values
1 == 1.0; // => true
1 === 1.0; // => false
// Comparisons between object instances
new stdClass() == new stdClass(); // => true, properties are equal
new stdClass() === new stdClass(); // => false, references are not identical
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