array ( 0 => 'index.php', 1 => 'PHP Manual', ), 'head' => array ( 0 => 'UTF-8', 1 => 'zh', ), 'this' => array ( 0 => 'ds-vector.map.php', 1 => 'Ds\\Vector::map', ), 'up' => array ( 0 => 'class.ds-vector.php', 1 => 'Ds\\Vector', ), 'prev' => array ( 0 => 'ds-vector.last.php', 1 => 'Ds\\Vector::last', ), 'next' => array ( 0 => 'ds-vector.merge.php', 1 => 'Ds\\Vector::merge', ), 'alternatives' => array ( ), 'source' => array ( 'lang' => 'en', 'path' => 'reference/ds/ds/vector/map.xml', ), ); $setup["toc"] = $TOC; $setup["toc_deprecated"] = $TOC_DEPRECATED; $setup["parents"] = $PARENTS; manual_setup($setup); ?>
(PECL ds >= 1.0.0)
Ds\Vector::map — Returns the result of applying a callback to each value
Returns the result of applying a callback
function to
each value in the vector.
callback
A callable to apply to each value in the vector.
The callable should return what the new value will be in the new vector.
The result of applying a callback
to each value in
the vector.
注意:
The values of the current instance won't be affected.
示例 #1 Ds\Vector::map() example
<?php
$vector = new \Ds\Vector([1, 2, 3]);
print_r($vector->map(function($value) { return $value * 2; }));
print_r($vector);
?>
以上示例的输出类似于:
Ds\Vector Object ( [0] => 2 [1] => 4 [2] => 6 ) Ds\Vector Object ( [0] => 1 [1] => 2 [2] => 3 )