How to Fix JSON_ERROR_SYNTAX When Decoding Hidden Character Issues?

JSON_ERROR_SYNTAX: Uncover Hidden Character Issues

When encountering the perplexing JSON_ERROR_SYNTAX error while decoding JSON using json_decode(), despite the assurance of online formatters that the JSON is valid, it's crucial to look for hidden characters.

PHP's json_decode() function is strict and will reject JSON with any syntax errors, including unseen control characters or invalid UTF-8 encoding. To resolve this issue, implement the following code:

<code class="php">for ($i = 0; $i <= 31; ++$i) { 
    $data = str_replace(chr($i), "", $data); 
}
$data = str_replace(chr(127), "", $data);</code>

This loop eliminates control characters (ASCII codes 0-31 and 127). Additionally, check for the "byte order mark" (0xEF 0xBB 0xBF) that may prefix the JSON and discard it:

<code class="php">if (0 === strpos(bin2hex($data), 'efbbbf')) {
   $data = substr($data, 3);
}</code>

After cleaning the JSON data, decode it using json_decode(). This comprehensive approach will resolve many instances of the JSON_ERROR_SYNTAX error, providing a more meaningful decoding experience.

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