PHP Array function array_walk usage and examples

This article mainly introduces the PHP array function Array_walk usage, analyzes the use of the user function of each member in the Array_walk log set, the need for friends can refer to the following

Specific as follows:

$words =array ("l" = "lemon", "o" = "Orange", "b" = "banana", "a" and "apple");//define a callback function, output array element function words _print ($value, $key, $prefix) {  echo "$prefix: $key = = $value <br>\n";} Defines a callback function that directly alters the value of the element function Words_alter (& $value, $key) {  $value =ucfirst ($value);  $key =strtoupper (key);} The value of the output element Array_walk ($words, ' words_print ', ' words ');//Change the value of the element Array_walk ($words, ' words_alter '); echo "<pre>"; Print_r ($words); echo "</pre>";

Class Internal invocation Example:

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 ' <PRE> '; $obj->func_1 (); Echo ' </PRE> ';

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