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=>$value
\n"; } //定义一个回调函数直接改变元素的值 function words_alter(&$value,$key){ $value=ucfirst($value); $key=strtoupper(key); } //输出元素的值 array_walk($words,'words_print','words'); //改变元素的值 array_walk($words,'words_alter'); echo "
"; print_r($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 '
'; $obj->func_1(); echo '
';
      

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