What is the significance of the notice "Use of undefined constant length - assumed 'length'" in PHP code?

The notice "Use of undefined constant length - assumed 'length'" in PHP code signifies that the code is trying to access an array index using a constant 'length' that has not been defined. To solve this issue, you can use the PHP function count() to get the length of the array instead of using an undefined constant. 

// Incorrect code triggering the notice
$array = [1, 2, 3];
for ($i = 0; $i < $array['length']; $i++) {
    // Do something
}

// Corrected code using count() to get the length of the array
$array = [1, 2, 3];
for ($i = 0; $i < count($array); $i++) {
    // Do something
}

Keywords

constant PHP notice undefined assumption

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