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Asked by Manu Last Modified
Answer 
Ravi K Thapliyal
Software Engineer with 15 years of Professional experience in MNCs (JP Morgan, TCS, Mastek)
I see a lot of beginners making this mistake; they'll have PHP code embedded inside a JavaScript function and they get surprised when it doesn't run on a button click or some other browser event. This is because PHP runs server-side and, hence, the embedded PHP code has already run when the page was served by the "server" and not when making your JavaScript call.
To run PHP code on a client-side browser event, you have to use AJAX and, optionally, JSON (for complex results). An AJAX call can run your PHP code and call your JavaScript method asynchronously when it returns with your PHP code's result as plain text or in JSON format.
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