PHP array_map() Function
Example
Send each value of an array to a function, multiply each value by itself, and return an array with the new values:
<?php
function myfunction($v)
{
return($v*$v);
}
$a=array(1,2,3,4,5);
print_r(array_map("myfunction",$a));
?>
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Definition and Usage
The array_map() function sends each value of an array to a user-made function, and returns an array with new values, given by the user-made function.
Tip: You can assign one array to the function, or as many as you like.
Syntax
array_map(myfunction,array1,array2,array3...)
| Parameter | Description |
|---|---|
| myfunction | Required. The name of the user-made function, or null |
| array1 | Required. Specifies an array |
| array2 | Optional. Specifies an array |
| array3 | Optional. Specifies an array |
Technical Details
| Return Value: | Returns an array containing the values of array1, after applying the user-made function to each one |
|---|---|
| PHP Version: | 4.0.6+ |
More Examples
Example 1
Using a user-made function to change the values of an array:
<?php
function myfunction($v)
{
if ($v==="Dog")
{
return
"Fido";
}
return $v;
}
$a=array("Horse","Dog","Cat");
print_r(array_map("myfunction",$a));
?>
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Example 2
Using two arrays:
<?php
function myfunction($v1,$v2)
{
if ($v1===$v2)
{
return "same";
}
return "different";
}
$a1=array("Horse","Dog","Cat");
$a2=array("Cow","Dog","Rat");
print_r(array_map("myfunction",$a1,$a2));
?>
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Example 3
Change all letters of the array values to uppercase:
<?php
function myfunction($v)
{
$v=strtoupper($v);
return $v;
}
$a=array("Animal" => "horse", "Type" => "mammal");
print_r(array_map("myfunction",$a));
?>
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Example 4
Assign null as the function name:
<?php
$a1=array("Dog","Cat");
$a2=array("Puppy","Kitten");
print_r(array_map(null,$a1,$a2));
?>
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PHP Array Reference
