PHP SplFixedArray offsetExists() Function

The SplFixedArray::offsetExists() function is an inbuilt function in PHP which is used to check provided index exist or not in an array.

Syntax:

bool SplFixedArray::offsetExists( $index )

Parameters: This function accepts single parameter $index which specifies the requested index.

Return Value: This function returns true if requested index found otherwise return false.

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

Program 1:

<?php

// Create a fixed size array
$gfg = new SplFixedArray(6);

$gfg[0] = 1;
$gfg[1] = 5;
$gfg[2] = 10;

// Check whether index exist or not
var_dump($gfg->offsetExists(2));
?>

Output:

bool(true)

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;

$i = 0;

// Iterate array and print values
while($i < 8) {

    // Check whether index exist or not
    var_dump($gfg->offsetExists($i));

    $i++;
}
?>

Output:

bool(true)
bool(true)
bool(true)
bool(true)
bool(true)
bool(true)
bool(false)
bool(false)

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