Vague Notice

[j.silver]

Hi,

This block code is from W3schools tutorials:

<?php

$cars = array("Volvo", "BMW", "Toyota");

$arrlength = count($cars);

for($x = 0; $x <= $arrlength; $x++) {

echo $cars[$x];

echo "<br>";

}

?>

The original block was without the equal sign in $x <= $arrlength;

I have added the equal sign to see what would happen. I got the same result but followed with:

Notice: Undefined offset: 3 in C:\xampp\htdocs\Testing\testing.php on line 14

I would appreciate it if someone would explain why I am getting this notice and its meaning. I thought the loop will stop and give the same result without any notice when it hits no value for the equal sign.

[justsomeguy]

The length of the array is 3, and you are telling it to loop as long as $x is less than or equal to 3. When $x is 3 it tries to access $cars[3], which does not exist.

[Chikwado]

You need to understand what this "<=" means in php.

[dsonesuk]

An array index value always begin with 0, so index will be 0, 1, 2, the array length will produce 3, using equals will index value 3 as the loop finishes, which as you can see does not exist.