如何從數組中提取特定的鍵字符串在PHP中？

Question

這是我的數組

 
Array 
     (
      [question_set] => Computer Basics 
      [question] => Who are You ? 
      [options_1] => RK 
      [options_2] => KAMAL 
      [options_3] => DPK 
      [options_4] => NARENDRA 
      [marks] => 5 
      [negative_marks] => 1 
      [type] => 1 
     ) 

OPTIONS_是動態的，意味着它可以是4,6或8

我想從options_1左右鍵上獲得價值「選項」。我怎樣才能做到這一點。

Answer 1

strpos比的preg_match方式更快，以供參考：strpos() vs preg_match()

使用的foreach和strpos（）：

$arr = array(
     "question_set" => "Computer Basics", 
     "question" => "Who are You ?", 
     "options_1" => "RK", 
     "options_2" => "KAMAL", 
     "options_3" => "DPK", 
     "options_4" => "NARENDRA", 
     "marks" => 5, 
     "negative_marks" => 1, 
     "type" => 1 
    ); 

$newArr = array(); 
foreach($arr as $key => $value) { 
    if(strpos($key, "options") !== false) { 
     $newArr[$key] = $value; 
    } 
} 

echo '<pre>'; 
    var_dump($newArr); 
echo '</pre>'; 

Answer 2

<?php 

$array = array("options_1" => "RK", 
       "options_213" => "21313", 
       "options_4" => "NARENDRA", 
       "foo"   => "bar", 5 , 5 => 89009, 
      ); 

$pattern = "/\boptions/"; 

foreach($array as $key => $value) { 
    if (preg_match($pattern,$key)){ 
     echo $key."\t=>\t".$value."\n"; 
    } 
}