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<?php $client_name = $_GET['client_name']; ?> <!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8" /> <title>My form</title> </head> <body> <form method='get'> <label>name: </label> <input type='text' name='client_name' /> <button type='submit'>Submit</button> </form> <p> <?php $client_name ? print $client_name : print 'Please Enter Name'; ?> </p> </body> </html>
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Warning: Undefined array key "client_name" in /in/YS7g6 on line 2 <!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8" /> <title>My form</title> </head> <body> <form method='get'> <label>name: </label> <input type='text' name='client_name' /> <button type='submit'>Submit</button> </form> <p> Please Enter Name </p> </body> </html>
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.25, 7.4.27 - 7.4.33
Notice: Undefined index: client_name in /in/YS7g6 on line 2 <!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8" /> <title>My form</title> </head> <body> <form method='get'> <label>name: </label> <input type='text' name='client_name' /> <button type='submit'>Submit</button> </form> <p> Please Enter Name </p> </body> </html>
Output for 7.3.32 - 7.3.33, 7.4.26
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8" /> <title>My form</title> </head> <body> <form method='get'> <label>name: </label> <input type='text' name='client_name' /> <button type='submit'>Submit</button> </form> <p> Please Enter Name </p> </body> </html>
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Notice: Undefined index: client_name in /in/YS7g6 on line 2 <!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8" /> <title>My form</title> </head> <body> <form method='get'> <label>name: </label> <input type='text' name='client_name' /> <button type='submit'>Submit</button> </form> <p> Please Enter Name </p> </body> </html>

preferences:
266.62 ms | 403 KiB | 460 Q