PHP extract() Function
Example
Assign the values "Cat", "Dog" and "Horse" to the variables $a, $b and $c:
<?php
$a = "Original";
$my_array = array("a" => "Cat","b" => "Dog", "c" => "Horse");
extract($my_array);
echo "\$a = $a; \$b = $b; \$c = $c";
?>
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Definition and Usage
The extract() function imports variables into the local symbol table from an array.
This function uses array keys as variable names and values as variable values. For each element it will create a variable in the current symbol table.
This function returns the number of variables extracted on success.
Syntax
extract(array,extract_rules,prefix)
| Parameter | Description |
|---|---|
| array | Required. Specifies the array to use |
| extract_rules | Optional. The extract() function checks for invalid
variable names and collisions with existing variable names. This parameter
specifies how invalid and colliding names are treated. Possible values:
|
| prefix | Optional. If EXTR_PREFIX_SAME, EXTR_PREFIX_ALL,
EXTR_PREFIX_INVALID or EXTR_PREFIX_IF_EXISTS are used in the extract_rules
parameter, a specified prefix is required.
This parameter specifies the prefix. The prefix is automatically separated from the array key by an underscore character. |
Technical Details
| Return Value: | Returns the number of variables extracted on success |
|---|---|
| PHP Version: | 4+ |
| Changelog: | The extract_rules value EXTR_REFS was added in PHP 4.3. The extract_rules values EXTR_IF_EXISTS and EXTR_PREFIX_IF_EXISTS were added in PHP 4.2. As of PHP 4.0.5, this function now returns the number of variables extracted. The extract_rules value EXTR_PREFIX_INVALID was added in PHP 4.0.5. As of PHP 4.0.5, the extract_rules value EXTR_PREFIX_ALL now includes numeric variables as well. |
More Examples
Example 1
Using all parameters:
<?php
$a = "Original";
$my_array = array("a" => "Cat", "b" => "Dog", "c" => "Horse");
extract($my_array, EXTR_PREFIX_SAME, "dup");
echo "\$a = $a; \$b = $b; \$c = $c; \$dup_a = $dup_a";
?>
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PHP Array Reference
