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:
2
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(); } ?> |
Output:
0 1 2 3 4 5
Reference: https://www.php.net/manual/en/splfixedarray.key.php
