替換字符串

Question

的二審

我只是想知道我怎麼能替換字符串的第二個實例在字符串中的PHP如如下：

a - b - c 

凡woulld第二個「-」後面加一個額外的空間但前提是它找到2.

Answer 1

$finds = explode('-', "a - b - c"); 
if (count($finds) == 3) { 
    $finds[2] = " {$finds[2]}"; 
} 

$finds = implode('-', $finds); 

Answer 2

子串字符串從第一個破折號的索引處開始，使用strpos，然後對該字符串的其餘部分執行str_replace。連接在一起。

Answer 3

$str ="a - b - c";  
if (substr_count($str,"-")>2){ 
    print preg_replace("/^(.*)-(.*)-(.*)/","\\1-\\2- \\3",$str); 
} 

Answer 4

**// User Function to replace string by Occurance** 

function str_occ_replace($from,$to,$subject,$occ){ 
    $myArray = explode($from,$subject); 
    print_r($myArray); 
    $mystring = ''; 
    $index = 1; 
    foreach($myArray as $ele){ 

     if($index !== $occ AND $index !== $arraySize) 
      $mystring .= $ele.$from; 
     else if($index !== $arraySize) 
      $mystring .= $ele.$to; 
     $index++; 
    } // End of Foreach 
    return $mystring; 
} // End of Function