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<?php
/**
* This file is part of the Nette Framework (https://nette.org)
* Copyright (c) 2004 David Grudl (https://davidgrudl.com)
*/
declare(strict_types=1);
namespace Nette\Utils;
use Nette;
class Helpers
{
/**
* Executes a callback and returns the captured output as a string.
*/
public static function capture(callable $func): string
{
ob_start(function () {});
try {
$func();
return ob_get_clean();
} catch (\Throwable $e) {
ob_end_clean();
throw $e;
}
}
/**
* Returns the last occurred PHP error or an empty string if no error occurred. Unlike error_get_last(),
* it is nit affected by the PHP directive html_errors and always returns text, not HTML.
*/
public static function getLastError(): string
{
$message = error_get_last()['message'] ?? '';
$message = ini_get('html_errors') ? Html::htmlToText($message) : $message;
$message = preg_replace('#^\w+\(.*?\): #', '', $message);
return $message;
}
/**
* Converts false to null, does not change other values.
*/
public static function falseToNull(mixed $value): mixed
{
return $value === false ? null : $value;
}
/**
* Returns value clamped to the inclusive range of min and max.
*/
public static function clamp(int|float $value, int|float $min, int|float $max): int|float
{
if ($min > $max) {
throw new Nette\InvalidArgumentException("Minimum ($min) is not less than maximum ($max).");
}
return min(max($value, $min), $max);
}
/**
* Looks for a string from possibilities that is most similar to value, but not the same (for 8-bit encoding).
* @param string[] $possibilities
*/
public static function getSuggestion(array $possibilities, string $value): ?string
{
$best = null;
$min = (strlen($value) / 4 + 1) * 10 + .1;
foreach (array_unique($possibilities) as $item) {
if ($item !== $value && ($len = levenshtein($item, $value, 10, 11, 10)) < $min) {
$min = $len;
$best = $item;
}
}
return $best;
}
/**
* Compares two values in the same way that PHP does. Recognizes operators: >, >=, <, <=, =, ==, ===, !=, !==, <>
*/
public static function compare(mixed $left, string $operator, mixed $right): bool
{
return match ($operator) {
'>' => $left > $right,
'>=' => $left >= $right,
'<' => $left < $right,
'<=' => $left <= $right,
'=', '==' => $left == $right,
'===' => $left === $right,
'!=', '<>' => $left != $right,
'!==' => $left !== $right,
default => throw new Nette\InvalidArgumentException("Unknown operator '$operator'"),
};
}
}