PHP extract() Function
The extract() function is an inbuilt function in PHP that imports variables into the current symbol table from an array. The keys of the array become variable names, and the values become variable values. This function was introduced in PHP 4.0.
Syntax
int extract ( array $array [, int $flags = EXTR_OVERWRITE [, string $prefix = "" ]] );
Parameters
| Parameter | Description | Is Compulsory |
|---|---|---|
| array | The array to extract variables from. | Compulsory |
| flags | Specifies how invalid/numeric keys and collisions are handled. Default is EXTR_OVERWRITE. |
Optional |
| prefix | Used only if EXTR_PREFIX_SAME, EXTR_PREFIX_ALL, or EXTR_PREFIX_INVALID is specified. |
Optional |
Return Values
The extract() function returns the number of variables successfully imported into the symbol table.
PHP Example
<?php
$data = array("a" => "Apple", "b" => "Banana", "c" => "Cherry");
extract($data);
echo "a: $a, b: $b, c: $c";
?>
Output
a: Apple, b: Banana, c: Cherry
PHP Example
<?php
$data = array("a" => "Apple", "b" => "Banana", "c" => "Cherry", "a" => "Avocado");
extract($data, EXTR_PREFIX_SAME, "prefix");
echo "a: $a, prefix_a: $prefix_a, b: $b, c: $c";
?>
Output
a: Avocado, prefix_a: Apple, b: Banana, c: Cherry