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php在字符串指定位置插入一段字符串

//插入一段字符串
/*
 * @param string $str    # 待处理字符串
 * @param int    $i      # 插入位置
 * @param string $substr # 需要插入的字符串
 */
function str_insert($str, $i, $substr) 
{ 
	for($j=0; $j<$i; $j++){ 
		$startstr .= $str[$j]; 
	} 
	for ($j=$i; $j<strlen($str); $j++){ 
		$laststr .= $str[$j]; 
	} 
	$str = ($startstr . $substr . $laststr); 
	return $str; 
}

 


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