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

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2016-07-25 09:04:501145browse
  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. ?>
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Output: Key exists!

Example 2:

  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:

  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!



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