php explode 函数使用详细理解

 
 
 



function dump($str=''){
echo '

'; 
  
 
   var_dump($str); 
  
 
   exit; 
  
 
   }; 
  
 
   //explode()函数 
  
 
  
 
  
 
   //explode(separator,string,limit) 
  
 
   //separator:分割标志符 
  
 
   //string:被分割的字符串 
  
 
   //limit :分割后返回的元素数目 
  
 
    
  
 
   $str = 'one,two,three,four'; 
  
 
    
  
 
   print_r(explode(',' , $str)); 
  
 
  
 
  
 
   // 零 limit 
  
 
   print_r(explode(',',$str,0)); 
  
 
  
 
  
 
   // 正的 limit  分成两组 
  
 
   print_r(explode(',',$str,2)); 
  
 
  
 
  
 
   // 负的 limit  除了最后两组 
  
 
   print_r(explode(',',$str,-2)); 
  
 
    
  
 
   //运行结果如下： 
  
 
   Array 
  
 
   ( 
  
 
   [0] => one 
  
 
   [1] => two 
  
 
   [2] => three 
  
 
   [3] => four 
  
 
   ) 
  
 
   Array 
  
 
   ( 
  
 
   [0] => one,two,three,four 
  
 
   ) 
  
 
   Array 
  
 
   ( 
  
 
   [0] => one 
  
 
   [1] => two,three,four 
  
 
   ) 
  
 
   Array 
  
 
   ( 
  
 
   [0] => one 
  
 
   [1] => two 
  
 
   ) 
  
 
  
 
  
 
  
 
  
?>