來自變量的PHP數組內容

Question

在我正在構建的應用程序中，我想使用變量中的內容創建一個數組。這是我的代碼：

$cont = '"q","w","e","r","t",'; 
$num = array(eval($cont)); 
foreach ($num as $v) { 
    echo "" . $v . "<br>OK<br><br>"; 
} 

它什麼都沒有返回。我用eval試過了，沒有我做錯了什麼？

Answer 1

猜你在找什麼後explode()：

$cont = '"q","w","e","r","t","y"'; 
$num = explode(',',$cont); 
foreach ($num as $v) { 
    echo "" . $v . "<br>OK<br><br>"; 
} 

輸出

"q" 
OK 

"w" 
OK 
.. 

Answer 2

eval是邪惡的，most of time。您可以使用preg_match_all代替：

$cont = '"q","w","e","r","t",'; 
preg_match_all("/\"([^\"]+)\"/", $cont, $matches); 
$num = $matches[1]; 
foreach ($num as $v) { 
    echo "$v<br>OK<br><br>"; 
} 

或者乾脆創建數組：

$num = array("q","w","e","r","t"); 
foreach ($num as $v) { 
    echo "$v<br>OK<br><br>"; 
} 

但是，如果所有這些警告和替代品是不夠的你，和你堅持使用eval，試試這個：

$cont = '"q","w","e","r","t",'; 
eval("\$num = array($cont);"); 
foreach ($num as $v) { 
    echo "$v<br>OK<br><br>"; 
}