回调实例
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<?php
/**
* 数组的回调
* 参数有参数
*/
//1.array_filter($arr,$callback)
//2.array_walk($arr,$callback())
//1.array_filter():回调处理数组中的每个元素，仅返回结果为true的元素
$ct = [1,2,0,'','',null,false,88,false,'php',null];
echo '原数组',var_export($ct,true),'共有：',count($ct),'个元素<hr>';
$ct1 = array_filter($ct);
echo '新数组',var_export($ct1,true),'共有：',count($ct1),'个元素<hr>';
//传入一个回调：匿名函数
$hs =['php','js','h5','java','python'];
$hs1 = array_filter($hs, function ($sc){
return $sc !== 'python';
});
echo var_export($hs1),'<hr>';
//2.array_walk():对数组每个元素的键和值进行处理
$arr =['name'=>'root','password=>admin'];
echo var_export($arr,true),'<hr>';
//格式化
array_walk($arr,function ($value,$key){
echo $key,':',$value,'<br>';
});
echo '<hr>';运行实例 »
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