php陣列函數array_key_exists() 尋找陣列鍵名是否存在
-
- $a=array("a"=>"Dog","b"=>"Cat");
- if (array_key_exists("a",$a))
- {
- echo "Key exists!";
- }
- else
- {
- echo "Key does not exist!";
- }
- ?>
复制代码
输出:
Key exists!
例2:
-
- $a=array("a"=>"Dog","b"=>"Cat");
- if (array_key_exists("c",$a))
- {
- echo "Key exists!";
- }
- else
- {
- echo "Key does not exist!";
- }
- ?>
复制代码
输出:
Key does not exist!
例3:
-
- $a=array("Dog",Cat");
- if (array_key_exists(0,$a))
- {
- echo "Key exists!";
- }
- else
- {
- echo "Key does not exist!";
- }
- ?>
复制代码
输出:
Key exists!
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