3v4l.org

run code in 300+ PHP versions simultaneously
<?php echo 'Hello World'; if( $_POST['textinput']) { echo $_POST['textinput']; } else { echo '<form method="post"> <textarea id="textinput" name="textinput"> </textarea> <input type="submit"/>'; }
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
Hello World Warning: Undefined array key "textinput" in /in/TaSbY on line 5 <form method="post"> <textarea id="textinput" name="textinput"> </textarea> <input type="submit"/>
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33
Hello World Notice: Undefined index: textinput in /in/TaSbY on line 5 <form method="post"> <textarea id="textinput" name="textinput"> </textarea> <input type="submit"/>
Output for 7.3.32 - 7.3.33
Hello World<form method="post"> <textarea id="textinput" name="textinput"> </textarea> <input type="submit"/>
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
Hello World Notice: Undefined index: textinput in /in/TaSbY on line 5 <form method="post"> <textarea id="textinput" name="textinput"> </textarea> <input type="submit"/>

preferences:
284.72 ms | 402 KiB | 370 Q