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