(PHP 4 >= 4.0.5, PHP 5, PHP 7)
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array_reduce() 锟斤拷锟截碉拷锟斤拷锟斤拷
callback 锟斤拷锟斤拷锟斤拷锟斤拷锟矫碉拷
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initial
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initial 锟斤拷锟斤拷锟斤拷array_reduce() 锟斤拷锟斤拷 NULL锟斤拷
Example #1 array_reduce() 锟斤拷锟斤拷
<?php
function sum($carry, $item)
{
$carry += $item;
return $carry;
}
function product($carry, $item)
{
$carry *= $item;
return $carry;
}
$a = array(1, 2, 3, 4, 5);
$x = array();
var_dump(array_reduce($a, "sum")); // int(15)
var_dump(array_reduce($a, "product", 10)); // int(1200), because: 10*1*2*3*4*5
var_dump(array_reduce($x, "sum", "No data to reduce")); // string(17) "No data to reduce"
?>