Table 14-7. Array Operators
| Example | Name | Result |
|---|---|---|
| $a + $b | Union | Union of $a and $b. |
| $a == $b | Equality | TRUE if $a and $b have the same elements. |
| $a === $b | Identity | TRUE if $a and $b have the same elements in the same order. |
| $a != $b | Inequality | TRUE if $a is not equal to $b. |
| $a <> $b | Inequality | TRUE if $a is not equal to $b. |
| $a !== $b | Non-identity | TRUE if $a is not identical to $b. |
The + operator appends the right handed array to the left handed, whereas duplicated keys are NOT overwritten.
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Union of $a and $b: |
Elements of arrays are equal for the comparison if they have the same key and value.
See also the manual sections on the Array type and Array functions.