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PHP array function array_key_exists() finds whether the array key exists

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Release： 2016-07-25 09:12:49
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Contents of this section: PHP array function array_key_exists()

array_key_exists() definition and usage The array_key_exists() function determines whether the specified key exists in an array. If the key exists, it returns true, otherwise it returns false.

Grammar array_key_exists(key,array) Parameter Description key is required. Specifies the key name. array required. Specifies the input array.

Example 1, PHP array function array_key_exists().

  2. $a=array("a"=>"Dog","b"=>"Cat");
  3. if (array_key_exists("a",$a))
  4. {
  5. echo "Key exists!";
  6. }
  7. else
  8. {
  9. echo "Key does not exist!";
  10. }
  11. ?>
Copy code

Output: Key exists!

Example 2, PHP array function array_key_exists().

  2. $a=array("a"=>"Dog","b"=>"Cat");
  3. if (array_key_exists("c",$a))
  4. {
  5. echo "Key exists!";
  6. }
  7. else
  8. {
  9. echo "Key does not exist!";
  10. }
  11. ?>
Copy code

Output: Key does not exist!

Example 3, PHP array function array_key_exists().

  2. $a=array("Dog",Cat");
  3. if (array_key_exists(0,$a))
  4. {
  5. echo "Key exists!";
  6. }
  7. else
  8. {
  9. echo "Key does not exist!";
  10. }
  11. ?>
Copy code

Output: Key exists!


Related labels：
php数组函数之array_key_exists() 查找数组键名是否存在
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