What are potential reasons for a variable like "$fehler" to be generated even when a condition like "is_numeric($_POST['level']) == false" is true?

The variable "$fehler" may be generated even when the condition "is_numeric($_POST['level']) == false" is true if there is another part of the code that assigns a value to "$fehler" regardless of the condition. To solve this issue, you should ensure that the assignment to "$fehler" only occurs when the condition is met. You can achieve this by using an "if" statement to check the condition before assigning a value to "$fehler". 

$fehler = ""; // Initialize $fehler variable

if (!is_numeric($_POST['level'])) {
    $fehler = "Error: Level must be a numeric value.";
}

// Rest of the code

Keywords

PHP variable condition is_numeric $_POST

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