Question

在我正在构建的应用程序中，我想使用变量中的内容创建一个数组。这是我的代码：

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

它什么都不返回。我用eval试了一下，没有我做错了什么？

Answer 1

猜猜你正在照顾的是explode()：

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

输出

"q"
OK

"w"
OK
..

Answer 2

eval是邪恶的， most of time 。您可以改为使用preg_match_all：

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

或者只是创建数组：

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

但如果所有这些警告和替代方案对您来说还不够，并且您坚持使用eval，请尝试以下操作：

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

来自变量的PHP数组内容

2 个答案: