How Can I Execute JavaScript Functions from Within PHP Code?

How to Execute JavaScript Functions with PHP

In PHP, the primary medium of interaction with web browsers is through the generation and manipulation of strings containing HTML. The ultimate goal of PHP is to produce an HTML string that, when loaded by a browser, triggers various events including JavaScript execution.

Therefore, calling JavaScript functions from PHP is not a direct process. Instead, the approach involves embedding JavaScript function calls within the HTML string generated by PHP. This can be achieved in several ways:

echo '<script type="text/javascript">', 'jsfunction();', '</script>';

Another method involves escaping PHP mode to enable direct output mode:

<?php // PHP code

?>
<script type="text/javascript">
    jsFunction();
</script>

In the context of AJAX requests, the JavaScript function will execute automatically upon receiving the server's response. jQuery, or similar frameworks, provide convenient methods for handling these requests without the need for manual function calls.

However, if sending a function name back to the AJAX call is desired, it can be achieved as follows:

$.get(
    'wait.php',
    {},
    function(returnedData) {
        // Returned data contains a JavaScript function name
        window[returnedData]();
    },
    'text'
);

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