如何在数组中找到由点分隔的键 - php [duplicate]
问题描述：
This question already has an answer here:
- PHP Get value from config array 1 answer
I have this key "this.key.exists". Key can be: a.b.c.d.e.f etc. this is only example.
And i want to check if exists in array:
$array = [ // depth of array and number of values are variable
'this' => [
'key' => [
'exists' => 'some value' // this is what am i looking for
],
'key2' => [
'exists' => 'some value' // this is not what am i looking for
],
],
'that' => [
'this' => [
'key' => [
'exists' => 'some value' // this is not what am i looking for
],
]
]
];
I need to find this key for update his value.
$array['this']['key']['exists'] = 'need to set new value';
Thanks for help
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答
$str = "this.key.exists";
$p = &$array; // point to array root
$exists = true;
foreach(explode('.', $str) as $step) {
if (isset($p[$step])) $p = &$p[$step]; // if exists go to next level
else { $exists = false; break; } // no such key
}
if($exists) $p = "new value";