PHP SplFixedArray key() Function

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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:

<?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"; 
?> 

Output:

Program 2:

<?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(); 
} 
?> 