PHP - Manual: preg_last_error

2024-11-15

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preg_last_error

(PHP 5 >= 5.2.0, PHP 7, PHP 8)

preg_last_error — 返回最后一个PCRE正则执行产生的错误代码

说明

preg_last_error(): int

返回最后一次PCRE正则执行的错误代码。

示例 #1 preg_last_error() 示例


<?php

preg_match('/(?:\D+|<\d+>)*[!?]/', 'foobar foobar foobar');

if (preg_last_error() == PREG_BACKTRACK_LIMIT_ERROR) {
    print 'Backtrack limit was exhausted!';
}

?>

以上例程会输出：

Backtrack limit was exhausted!

返回值

返回下面常量中的一个(查看它们自身的解释):

PREG_NO_ERROR
PREG_INTERNAL_ERROR
PREG_BACKTRACK_LIMIT_ERROR （参见 pcre.backtrack_limit）
PREG_RECURSION_LIMIT_ERROR （参见 pcre.recursion_limit）
PREG_BAD_UTF8_ERROR
PREG_BAD_UTF8_OFFSET_ERROR （自 PHP 5.3.0 起）
PREG_JIT_STACKLIMIT_ERROR (自 PHP 7.0.0 起)

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User Contributed Notes 10 notes

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gk at anuary dot com ¶

8 years ago


In PHP 5.5 and above, getting the error message is as simple as:

<?php
echo array_flip(get_defined_constants(true)['pcre'])[preg_last_error()];

down

Daniel Klein ¶

2 years ago


Here is a correction to one of the previous "get error message" snippets. It filters out the non-error codes which stops "Warning:  array_flip(): Can only flip STRING and INTEGER values!" from being emitted due to ["PCRE_JIT_SUPPORT"]=>bool(true):

<?php
echo array_flip(array_filter(get_defined_constants(true)['pcre'], function ($value) {
  return substr($value, -6) === '_ERROR';
}, ARRAY_FILTER_USE_KEY))[preg_last_error()];

down

andre at koethur dot de ¶

9 years ago


Here is a more advanced function to convert an error code to text:

<?php

function preg_errtxt($errcode)
{
    static $errtext;

    if (!isset($errtxt))
    {
        $errtext = array();
        $constants = get_defined_constants(true);
        foreach ($constants['pcre'] as $c => $n) if (preg_match('/_ERROR$/', $c)) $errtext[$n] = $c;
    }

    return array_key_exists($errcode, $errtext)? $errtext[$errcode] : NULL;
}

?>

down

eu at ericruiz dot com dot br ¶

5 years ago


Take it into account before use this function.

My php --version
PHP 5.6.29 (cli) (built: Dec  8 2016 09:19:46) 
Copyright (c) 1997-2016 The PHP Group
Zend Engine v2.6.0, Copyright (c) 1998-2016 Zend Technologies

On Linux Fedora 23 4.8.13-100.fc23.x86_64 #1 SMP Fri Dec 9 14:51:40 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

<?php
// @see http://stackoverflow.com/questions/4440626/how-can-i-validate-regex

// returns true because  there is no opening "(" for the closing ")"
var_dump(preg_match('~InvalidRegular)Expression~', null) === false);

// this SHOULD be something different from 0, but...
var_dump(preg_last_error());
?>

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johan at bluemoonit dot net ¶

12 years ago


The above function pcre_error_deocde [sic] is not correct - not all of the used constants are errors constants. For example, when the error is actually PREG_BAD_UTF8_ERROR, the function outputs the text for PREG_SPLIT_OFFSET_CAPTURE.

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andre at koethur dot de ¶

8 years ago


Just an addition to my previous note: In unicode mode (with "u" modifier), PREG_BAD_UTF8_ERROR only reflects errors in the subject string. If the pattern itself contains invalid characters, preg_match() (or preg_match_all()) returns false but preg_last_error() returns 0 indicating PREG_NO_ERROR. Instead, php issues a warning: "preg_match(): Compilation failed: invalid UTF-8 string at offset 0"

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nicoSWD ¶

1 year ago


PHP 8 has a native function to retrieve the actual error message, so these helper functions are no longer necessary.

https://www.php.net/preg_last_error_msg

<?php

preg_match('/(?:\D+|<\d+>)*[!?]/', 'foobar foobar foobar');

if (preg_last_error() !== PREG_NO_ERROR) {
    echo preg_last_error_msg(); // Prints "Backtrack limit exhausted"
}

?>

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zerodahero at gmail dot com ¶

2 years ago


In PHP 7.3+, and depending on the environment, there may be other constants that aren't ints which will cause errors with array_flip. I opted to go with a RegexException and a filter on gk's note.

<?php

class RegexException extends \Exception {

    public $errorCode;

    public function __construct(
        int $errorCode,
        string $additionalMessage = null
    ) {
        $this->errorCode = $errorCode;

        $errorMessage = $this->getErrorString($errorCode) ?? 'Unknown regex error';
        $additionalMessage = $additionalMessage ? " $additionalMessage" : '';

        parent::__construct("Regex error thrown: $errorMessage." . $additionalMessage);
    }

    /**
     * Gets an error string (const name) for the PCRE error code
     *
     * @param int $errorCode
     *
     * @return string|null
     */
    private function getErrorString(int $errorCode): ?string
    {
        $pcreConstants = get_defined_constants(true)['pcre'] ?? [];

        /*
         * NOTE: preg_last_error() returns an int, but there are constants
         * in PHP 7.3+ that are strings, bools, or otherwise. We can pretty
         * safely filter out the non-integers to fetch the appropriate
         * error constant name.
         */
        $pcreConstants = array_filter($pcreConstants, function ($code) {
            return is_int($code);
        });

        $errorStrings = array_flip($pcreConstants);

        return $errorStrings[$errorCode] ?? null;
    }

Usage:

throw new RegexException(preg_last_error());

down

-1

Vladimir Valikaev ¶

2 years ago


Getting error as text (small update):

<?php
echo array_flip(array_filter(get_defined_constants(true)['pcre'], function($v) { return is_integer($v); }))[preg_last_error()];

down

-1

Anonymous ¶

2 years ago


If you use T-Regx library, to get the last constant, you can use

<?php

echo preg_last_error_constant(); // 'PREG_BAD_UTF8_ERROR'

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preg_last_error

说明

返回值

User Contributed Notes 10 notes