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array_map()函数返回用户自定义函数作用后的数组。回调函数接受的参数
数目应该和传递给array_map()函数的数组数目一直。
array_map(function,array1,array2,array3...);
function：必需。用户自定义的函数名称，或者是null
array1：必需。规定数组
array2：可选。规定数组
array3：可选。规定数组
<?php function myfunction($v){ if($v === 'Dog'){ return 'Fido'; } return $v; } $a = array('Horse','Dog','Cat'); print_r(array_map('myfunction',$a)); ?> 输出：Array ( [0] => Horse [1] => Fido [2] => Cat )
使用多个参数：
<?php function myfunction($v1,$v2){ if($v1 === $v2){ return "same"; }else{ return "different"; } } $a1 = array("Horse","Dog","Cat"); $a2 = array("Cow","Dog","Rat"); print_r(array_map('myfunction',$a1,$a2)); ?> 输出：Array ( [0] => different [1] => same [2] => different )
自定义函数名设置为null时：
<?php $a1 = array("Dog","Cat"); $a2 = array("Puppy","Kitten"); print_r(array_map(null,$a1,$a2)); ?> 输出：Array ( [0] => Array ( [0] => Dog [1] => Puppy ) [1] =>
Array ( [0] => Cat [1] => Kitten ) )
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2022-08-18
2022-08-17
2022-11-06
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