How can I write to a file in PHP based on a variable being equal to or less than 0?

To write to a file in PHP based on a variable being equal to or less than 0, you can use an if statement to check the value of the variable before writing to the file. If the variable meets the condition, you can use file_put_contents() function to write to the file. 

<?php
$variable = -5;

if ($variable <= 0) {
    $file = 'output.txt';
    $data = "Variable is equal to or less than 0: $variable\n";
    file_put_contents($file, $data, FILE_APPEND);
}
?>

Keywords

PHP file writing conditional statement variable comparison error handling

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