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How do I open a warning window using PHP?

| |
Program 1:PHP program for pop-up window with warning on screen.
// PHP program for displaying a notification
// message box on screen 
// Show alert window echo ’ ’ ;  
Output: Program 2:PHP program for warning popup on screen.
// PHP program for displaying the notification
// message box on the screen 
// Function definition function function_alert ( $message ) { // Show warning window echo "" ; }  
// function call function_alert ( "Welcome to Geeks for Geeks" );  


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