function write_to_errors_file($str)
{
require __DIR__ . '/modules/matrix_file_write.php';
$path = __DIR__ . '/errors.php';
$errors = error_read_file($path);
$errors[] = $str;
error_write_file($errors, $path);
return;
}
<title></title>
</head>
<body>
<?php
$dir = $_GET['dir'];
require $dir . '/modules/matrix_file_write.php';
$path = $dir . '/errors.php';
$errors = error_read_file($path);
if (isset($errors[0])) {
foreach ($errors as $el) {
echo "</br>";
echo $el;
}
$errors = [];
error_write_file($errors, $path);
}
?>
<h1>Matrix Inversion service</h1>
<h2>Input matrix size, please.</h2>
<h2>Matrix size should not be less than 1!<br></h2>
<form action="/matrix_size_input.php" method="post">
<input type="number" autofocus required name="size">
<input type="submit" value="matrix size input"/>
</form>
</body>
</html>