Why Does json_encode() Fail with Single Quotes in Post

PHP's json_encode Function: Dealing with Single Quote Failure

Problem:

When using json_encode() to convert a stdClass object with single quotes in the post title, the resulting JSON returns null for that key. This suggests an issue with handling the single quote.

Cause:

The issue lies in the encoding of the database. The single quote is likely encoded in a non-UTF-8 format, which causes json_encode() to fail silently. To resolve this, the connection encoding needs to be set before executing database queries.

Solution:

The appropriate method to set the connection encoding depends on the API being used:

• For the old, deprecated API, call mysql_set_charset("utf8").
• For mysqli, call mysqli_set_charset("utf8").
• For PDO in PHP >= 5.3.6, add the charset parameter to the connection string. For earlier versions, execute SET NAMES utf8.

Additional Considerations:

Using utf8_encode() on all text can be considered, but it may not produce the correct result for all non-ascii characters. To ensure accurate handling, it is recommended to use UTF-8 as the client encoding.

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