PHP Array Operators: Manipulating Arrays in PHP
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Table of Content:
The PHP array operators are used to compare arrays.
| Operator | Name | Example | Result |
|---|---|---|---|
| + | Union | $x + $y | Union of $x and $y |
| == | Equality | $x == $y | Returns true if $x and $y have the same key/value pairs |
| === | Identity | $x === $y | Returns true if $x and $y have the same key/value pairs in the same order and of the same types |
| != | Inequality | $x != $y | Returns true if $x is not equal to $y |
| <> | Inequality | $x <> $y | Returns true if $x is not equal to $y |
| !== | Non-identity | $x !== $y | Returns true if $x is not identical to $y |
Example: + Union
Union of $x and $y
Code:
<!DOCTYPE html> <html> <body> <?php $x = array("a" => "red", "b" => "green"); $y = array("c" => "blue", "d" => "yellow"); print_r($x + $y); // union of $x and $y ?> </body> </html>
Output:
The above code will produce the following result-
Array ( [a] => red [b] => green [c] => blue [d] => yellow )
Example: == Equality
Returns true if $x and $y have the same key/value pairs
Code:
<!DOCTYPE html> <html> <body> <?php $x = array("a" => "ram", "b" => "shyam"); $y = array("c" => "rama", "d" => "shyma"); var_dump($x == $y); ?> </body> </html>
Output:
The above code will produce the following result-
bool(false)
Example: === Identity
Returns true if $x and $y have the same key/value pairs in the same order and of the same types
Code:
<!DOCTYPE html> <html> <body> <?php $x = array("a" => "ram", "b" => "mohon"); $y = array("c" => "rama", "d" => "mohona"); var_dump($x === $y); ?> </body> </html>
Output:
The above code will produce the following result-
bool(false)
Example: != Inequality
Returns true if $x is not equal to $y
Code:
<!DOCTYPE html> <html> <body> <?php $x = array("a" => "red", "b" => "green"); $y = array("c" => "blue", "d" => "yellow"); var_dump($x != $y); ?> </body> </html>
Output:
The above code will produce the following result-
bool(true)
Example: <> Inequality
Returns true if $x is not equal to $y
Code:
<!DOCTYPE html> <html> <body> <?php $x = array("a" => "red", "b" => "green"); $y = array("c" => "blue", "d" => "yellow"); var_dump($x <> $y); ?> </body> </html>
Output:
The above code will produce the following result-
bool(true)
Example: !== Non-identity
Returns true if $x is not identical to $y
Code:
<!DOCTYPE html> <html> <body> <?php $x = array("a" => "red", "b" => "green"); $y = array("c" => "blue", "d" => "yellow"); var_dump($x !== $y); ?> </body> </html>
Output:
The above code will produce the following result-
bool(true)