英[ɪgˈzɪst] 美[ɪɡˈzɪst]
##vi.Existence; survive; live; continue to exist Third person singular: exists Present participle: existing Past tense: existed Past participle: existedphp array_key_exists() function syntax
Function:Check whether the specified key name exists in an array
Syntax:array_key_exists(key,array)
Parameters:
| Parameters | Description |
| key | Required. Specifies the key name. |
| array | Required. Specifies an array. |
Description:Returns true if the key name exists, returns false if the key name does not exist.
php array_key_exists() function example
"西门大官人","php中文网"=>"灭绝师太"); if (array_key_exists("phpStudy",$a)) { echo "存在！"; } else { echo "不存在！"; } ?>
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Output:
不存在！