php array get key name based on value
The php array obtains the key name function according to the value. There are mainly two built-in functions that can be used. array_search and array_keys are used to handle returning a single key name and multiple key names.
Specific examples are as follows:
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<?php
/**
* php array get key by value
* php数组根据值获取键名
* @author http://www.phpff.com
*/
$items
=
array
(
"banana"
=>
"fruit"
,
"tomato"
=>
"vegetable"
,
"lentil"
=>
"bean"
,
"apple"
=>
"vegetable"
);
//1.返回一个键名，如果值有重复返回第一个键名
$key
=
array_search
(
'vegetable'
,
$items
);
echo
$key
;
//tomato
//2.返回多个键名
$keys
=
array_keys
(
$items
,
'vegetable'
);
print_r(
$keys
);
/*
Array
(
[0] => tomato
[1] => apple
)
*/
?>
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