Laravel Eloquent model, text being cut off at maximum length

While working with Laravel, I encountered an issue when loading a database row into an Eloquent object. The problem arose from one of the columns being a longtext type containing a JSON encoded array with over 2 million characters. The original error I faced was related to json_decode failing on this specific column's value.

To troubleshoot, I conducted a test using tinker with the following simplified code:

$item = Item::find(1);
echo $item->long_text_field;
var_dump(json_decode($item->long_text_field));
echo strlen($item->long_text_field);

The output on my local Vagrant instance displayed the correct values as expected.

...very long JSON array represented as text, matching the actual DB entry...
...the outcome of var_dump for the JSON array...
2334040

However, on my remote development server, the result showed:

...portion of the lengthy JSON array truncated midway...
NULL
1048576

This truncation caused the json_decode function to fail due to incomplete data. It cut off at a section like:

"Eff Date":"1\”

When it should have been:

"Eff Date":"1\/30\/14 16:13"

The longtext includes several escaped slashes similar to that, with no unusual characters at that point. I am puzzled why the text is truncated on one server but not on another. Can anyone provide insight into this matter?

phpmysqljsonlaravellongtext

Answer №1

The issue lies in the default size of PDO::MYSQL_ATTR_MAX_BUFFER_SIZE, which is set to 1Mb.

To adjust this in Laravel, you will need to include an option in your database.php configuration file.

'connections' => [
    'mydb' => [
        'driver'    => 'mysql',
        'host'      => 'localhost',
        'database'  => 'mydb',
        'options'   => [
            PDO::MYSQL_ATTR_MAX_BUFFER_SIZE => 16777216
        ]
    ]
]

The code snippet above will increase the max attribute size to 16Mb.

It's important to note that if you're using the mysqlnd driver, you no longer require this adjustment. In fact, including it may cause errors as the PDO::MYSQL_ATTR_MAX_BUFFER_SIZE constant is not supported.

Answer №2

One potential issue could be occurring during the json_encoding process, which happens before retrieving the results.

To address this, you can try turning off forward slash escaping with the following code snippet:

$str = "1/30/14 16:13";
echo json_encode($str, JSON_UNESCAPED_SLASHES);

This issue is likely related to having magic_quotes_gpc enabled, indicating that you may be using a PHP version older than 5.2.

According to the PHP manual:

; Magic quotes
;

; Disable magic quotes for incoming GET/POST/Cookie data.
magic_quotes_gpc = Off

; Disable magic quotes for runtime-generated data, such as data from SQL queries or exec() function.
magic_quotes_runtime = Off

; Do not use Sybase-style magic quotes (escape ' with '' instead of \').
magic_quotes_sybase = Off

If you do not have access to the server configuration, you can also disable magic quotes using .htaccess. Here's an example:

php_flag magic_quotes_gpc Off

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