PHP | SplFixedArray key() Function

The SplFixedArray::key() function is an inbuilt function in PHP which is used to get the key of the current index of the array.

Syntax:

int SplFixedArray::key()

Parameters: This function does not accept any parameter.



Return Value: This function returns the key of the current index of the array.

Below programs illustrate the SplFixedArray::key() function in PHP:

Program 1:

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<?php
  
// Create a fixed size array
$gfg = new SplFixedArray(6);
  
$gfg[0] = 1;
$gfg[1] = 5;
$gfg[2] = 1;
  
$gfg->next();
$gfg->next();
  
// Print key of current position
echo $gfg->key() . "\n";
?>

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Output:

2

Program 2:

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<?php
  
// Create some fixed size array
$gfg = new SplFixedArray(6);
  
$gfg[0] = 1;
$gfg[1] = 5;
$gfg[2] = 1;
$gfg[3] = 11;
$gfg[4] = 15;
$gfg[5] = 17;
  
// Iterate array and print values
while($gfg->valid()) {
      
    // Print Key of each Index
    echo $gfg->key(). "\n";
    $gfg->next();
}
?>

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Output:

0
1
2
3
4
5

Reference: https://www.php.net/manual/en/splfixedarray.key.php



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