将字符串转换为数组

Question

我有以下字符串：test1__test2__test3__test4__test5__test6=value

可能有任何数量的测试密钥。

我想写，可以把上面的字符串到一个数组

$data[test1][test2][test3][test4][test5][test6] = "value"; 

这是可能的功能？

Answer 1

$data = array(); 

// Supposing you have multiple strings to analyse... 
foreach ($strings as $string) { 
    // Split at '=' to separate key and value parts. 
    list($key, $value) = explode("=", $string); 

    // Current storage destination is the root data array. 
    $current =& $data; 

    // Split by '__' and remove the last part 
    $parts = explode("__", $key); 
    $last_part = array_pop($parts); 

    // Create nested arrays for each remaining part. 
    foreach ($parts as $part) 
    { 
     if (!array_key_exists($part, $current) || !is_array($current[$part])) { 
      $current[$part] = array(); 
     } 
     $current =& $current[$part]; 
    } 

    // $current is now the deepest array ($data['test1']['test2'][...]['test5']). 
    // Assign the value to his array, using the last part ('test6') as key. 
    $current[$last_part] = $value; 
} 

Answer 2

我想这是...

$string = "test1__test2__test3__test4__test5__test6=value"; 
$values = explode('=',$string); 
$indexes = explode('__',$values[0]); 
$data[$indexes[0]][$indexes[1]][$indexes[2]][$indexes[3]][$indexes[4]][$indexes[5]] = $values[1]; 

Answer 3

是的，它是可能的：

list($keys, $value) = explode('=', $str); 
$keys = explode('__', $keys); 

$t = &$data; 
$last = array_pop($keys); 

foreach($keys as $key) { 
    if(!isset($t[$key]) || !is_array($t[$key])) { 
     // will override non array values if present 
     $t[$key] = array(); 
    } 
    $t = &$t[$key]; 
} 

$t[$last] = $value; 

DEMO

参考：list，explode，=&，is_array，array_pop

Answer 4

function special_explode($string) { 
    $keyval = explode('=', $string); 
    $keys = explode('__', $keyval[0]); 
    $result = array(); 

    //$last is a reference to the latest inserted element       
    $last =& $result; 
    foreach($keys as $k) { 
    $last[$k] = array(); 
    //Move $last                 
    $last =& $last[$k]; 
    } 

    //Set value                 
    $last = $keyval[1]; 
    return $result; 
} 

//Test code: 
$string = 'test1__test2__test3__test4__test5__test6=value'; 
print_r(special_explode($string)); 

Answer 5

$str = ...; 
eval(str_replace('__', '][', 
preg_replace('/^(.*)=(.*)$/', '\$data[$1]=\'$2\';', $str))); 

更简单的方法，假设$str是可信的数据