PHP array function array_walk usage and examples

This article mainly introduces the usage of PHP array function array_walk, and analyzes the usage skills of array_walk to call user functions for each member of the array. Friends who need it can refer to it

The details are as follows:

$words=array("l"=>"lemon","o"=>"orange","b"=>"banana","a"=>"apple");
//定义一个回调函数，输出数组元素
function words_print($value,$key,$prefix){
  echo "$prefix:$key=>$value<br>\n";
}
//定义一个回调函数直接改变元素的值
function words_alter(&$value,$key){
  $value=ucfirst($value);
  $key=strtoupper(key);
}
//输出元素的值
array_walk($words,&#39;words_print&#39;,&#39;words&#39;);
//改变元素的值
array_walk($words,&#39;words_alter&#39;);
echo "<pre class="brush:php;toolbar:false">";
print_r($words);
echo "

";

Example of class internal calls:

class ArrayWalk {
  /**
  * properties:
  */
  var $body_chunk = array('0'=>'Dewen', '1'=>'PHP', 2=>'Linux');
  /////////////////////////////////////////////////
  // VARIABLE METHODS
  /////////////////////////////////////////////////
  function ArrayWalk (){
  }
  function func_1(){
  print_r($this->body_chunk);
  array_walk ($this->body_chunk, array($this,'SpellStrToLower'));
  print_r($this->body_chunk);
  }
  function SpellStrToLower (&$str){
    $str = strtolower ($str);
  }
}
$obj = new ArrayWalk();
echo &#39;<PRE>&#39;;
$obj->func_1();
echo &#39;

';

Summary: The above is the entire content of this article, I hope it will be helpful to everyone's study.

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