我正试图从基于字符串的数组中删除一个项；
public function delete($path){
// a key path given
if(strpos($path, '.') !== false){
$parts = explode('.', $path);
$first_key = array_shift($parts);
$data = $this->get($path);
// first key doesn't exist
if($data === false)
return false;
$parts = implode('"]["', $parts);
if(eval('if(isset($data["'.$parts.'"])){ unset($data["'.$parts.'"]); return true; } return false;'))
return $this->set($first_key, $data);
}
// a single key given
if(isset($this->data[$path]){
unset($this->data[$path]);
return true;
}
return false;
}
而且它只适用于单键。显然，由于某种原因，eval没有修改$data。
delete('test')有效，但delete('test.child')不。。。
我不明白为什么这里需要eval（）。请参阅以下内容来替换您的eval（）构造：
<?php
function removeFromArray(&$array, $path)
{
if (!is_array($path)) {
$path = explode('.', trim($path, '.'));
}
$current = &$array;
while ($path) {
$key = array_shift($path);
// isset() would fail on `$array[$key] === null`
if (!array_key_exists($key, $current)) {
// abort if the array element does not exist
return false;
}
if (!$path) {
// reached the last element
unset($current[$key]);
return true;
}
if (!is_array($current[$key])) {
// can't go deeper, so abort
return false;
}
// continue with next deeper element
$current = &$current[$key];
}
return false;
}
$data = array(
'a' => 1,
'b' => array(
'c' => 2,
'd' => 3,
'e' => array(
'f' => 4,
),
),
);
var_dump(
removeFromArray($data, 'b.e.f'),
$data,
removeFromArray($data, 'b.c'),
$data
);
function unset_multiple($arr = [], $keys = [], $limitKeys = 30){
if($keys && count($keys) <= $limitKeys && is_array($arr) && count($arr) > 0){
foreach($keys as $key){
$keys[$key] = null;
}
return array_diff_key($arr, $keys);
} else{
throw new Exception("Input array is invalid format or number of keys to remove too large");
}
}
示例名为：
$arr = array("name" => "Vuong", "age" => 20, "address" => "Saigon");
$res = unset_multiple($arr, ["name", "age"]);
//Result: ["address" => "Saigon"]
确保$keys param在$arr param中具有所有可用键（仅二维数组）。需要记住的是，此函数是快速删除数组中多个元素的助手，而不是在所有情况下都返回绝对准确的结果。