How does the output of PHP functions like echo differ from the actual content of a variable when dealing with JSON data?

When outputting JSON data in PHP, using functions like echo may not properly encode the data, leading to potential issues with special characters or incorrect formatting. To ensure proper encoding and output of JSON data, it is recommended to use the json_encode function to convert PHP variables into a JSON string before outputting them. 

// Example of properly encoding and outputting JSON data
$data = array("name" => "John", "age" => 30);
$json_data = json_encode($data);
echo $json_data;

Keywords

PHP echo JSON variable output

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