PHP SplFixedArray key() Function

Last Updated : 23 Jun, 2023
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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 
<?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: 
2
Program 2: php 
<?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();
}
?>
Output: 
0
1
2
3
4
5
Reference: https://www.php.net/manual/en/splfixedarray.key.php

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