Why Does `json_encode` Add Backslashes to My JSON Data?

Why Is Json_encode Adding Backslashes?

Upon employing json_encode within a file upload script, it has been discovered that the resulting JSON data contains unexpected backslashes. This raises the question of why json_encode is introducing these escapes.

The JSON_UNESCAPED_SLASHES Option

The answer lies in a specific option available within json_encode. By default, json_encode escapes certain characters, including slashes (backslashes), to ensure that the generated JSON remains valid. However, in some cases, such as when dealing with URLs like the one provided, these escapes can be undesirable.

To address this, the JSON_UNESCAPED_SLASHES option was introduced in PHP version 5.4. When utilized, this option instructs json_encode to avoid escaping slashes, effectively resolving the issue at hand.

Code Modification

To implement the solution, simply incorporate the JSON_UNESCAPED_SLASHES constant as a second parameter within the json_encode function. The modified code should look like this:

echo json_encode($result, JSON_UNESCAPED_SLASHES); // <-- Adds the JSON_UNESCAPED_SLASHES option

This ensures that the resulting JSON does not contain any unnecessary backslashes, delivering the desired result:

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

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