php獲取兩個字符串之間的字符串與偏移量

Question

function getdatabetween($string, $start, $end){ 
    $sp = strpos($string, $start)+strlen($start); 
    $ep = strpos($string, $end)-strlen($start); 
    $data = trim(substr($string, $sp, $ep)); 
    return trim($data); 
} 
$dt = "Hello cat bye Hello dog bye"; 
echo getdatabetween($dt, 'Hello', 'bye'); 

如何將偏移量添加到此函數？

實施例：

$dt = "Hello cat bye Hello dog bye"; 
echo getdatabetween($dt, 'Hello', 'bye', 0); //result = cat 
echo getdatabetween($dt, 'Hello', 'bye', 1); //result = dog 

Answer 1

功能strpos實現OFFSET PARAM。

試試這個

function getdatabetween($string, $start, $end, $offset){ 
     $sp = strpos($string, $start, $offset)+strlen($start); 
     $ep = strpos($string, $end, $offset)-strlen($start); 
     $data = trim(substr($string, $sp, $ep)); 
     return trim($data); 
}