How to Resolve \'SYNTAX ERROR\' in JSON_DECODE() Despit Valid JSON Format?

JSON_ERROR_SYNTAX Despite Valid JSON on Online Formatters

Encountering a "SYNTAX ERROR" response from json_decode() while the JSON appears valid on external formatters can be puzzling. Here's a comprehensive solution:

Hidden Characters Removal:

Invisible characters can cause syntax errors. Remove these characters using the following code:

<code class="php">$json = file_get_contents('http://www.mywebservice');

// Remove unwanted characters
for ($i = 0; $i <p><strong>Decoding the Cleaned JSON:</strong></p>
<p>Now that the hidden characters are removed, decode the JSON:</p>
<pre class="brush:php;toolbar:false"><code class="php">$obj = json_decode($json);</code>

Error Handling:

If decoding still fails, check the specific error code using json_last_error():

<code class="php">switch (json_last_error()) {
    case JSON_ERROR_NONE:
        echo 'JSON_ERROR_NONE';
        break;
    case JSON_ERROR_DEPTH:
        echo 'JSON_ERROR_DEPTH';
        break;
    // ... Other error codes
    default:
        echo 'Unknown Error';
        break;
}</code>

By following these steps, you can rectify JSON syntax errors and successfully decode JSON data. PHP 5.5's json_last_error_msg() function provides additional error details, but may not be necessary after resolving hidden characters and decoding issues.

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