Why are there backslashes in my JSON encoded data?

Backslash Escapes in JSON Encoding

When using json_encode to convert an associative array into JSON, some users encounter an issue where the encoded data includes unwanted backslashes. This issue stems from a potential mismatch between the JSON encoding process and subsequent parsing.

Root Cause of Backslashes

The standard JSON encoding in PHP escapes special characters, including backslashes, to ensure data integrity. However, if the encoded data is further processed by external JavaScript functions like .parseJSON, it may lead to unintended double-escaping.

Solution: JSON_UNESCAPED_SLASHES Option

To resolve this issue, you can explicitly specify the JSON_UNESCAPED_SLASHES option as the second parameter of json_encode. This option instructs PHP not to escape backslashes during encoding, thereby eliminating the double-escaping problem.

$result = [
    'logo_url' => 'http://mysite.com/uploads/gallery/7f/3b/f65ab8165d_logo.jpeg',
    'img_id' => 54,
    'feedback' => [
        'message' => 'File uploaded',
        'success' => 1
    ]
];

echo json_encode($result, JSON_UNESCAPED_SLASHES);

This code will output valid JSON without any additional backslashes:

{"logo_url":"http://mysite.com/uploads/gallery/7f/3b/f65ab8165d_logo.jpeg","img_id":"54","feedback":{"message":"File uploaded","success":true}}

The above is the detailed content of Why are there backslashes in my JSON encoded data?. For more information, please follow other related articles on the PHP Chinese website!