An example of implementing relative path of php algorithm

An example of implementing relative path of php algorithm

Calculate the relative path (the same directory can be ignored and represented by../or./)

Implementation code:

class Relatively{ 
  private function __construct(){ 
     
  } 
  /** 
   *  Calculate the relative path (the same directory can be ignored with ../  Or  ./  Represents)  
   * @param Strint $path1 
   * @param Strint $path2 
   * @return string 
   */ 
  public static function relaroot($path1,$path2){ 
    $rearray=array(); 
    $arr1=explode('/', dirname($path1)); 
    $arr2=explode('/', dirname($path2)); 
    for($i=0,$len=count($arr2)-1;$i<$len;$i++){ 
      if($arr1[$i]!=$arr2[$i]){ 
        break; 
      } 
      if($i==1){ 
        $rearray=array(); 
      } 
      if($i!=1 && $i<$len){ 
        $rearray=array_fill(0,$len-$i,'..'); 
      } 
      if($i==$len){ 
        $rearray=array('./'); 
      } 
    } 
    $reroot=array_merge($rearray,array_slice($arr2, $i)); 
    return implode('/', $reroot); 
  } 
} 
$path1="a/b/c/d/index.php"; 
$path2="/a/b/12/34/index1.php"; 
$a=Relatively::relaroot($path1, $path2); 
echo $a; 

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