前端页面 index.php
<?php
include "connect.php";
?>
<?php echo "a:".($a); ?> <br>
<?php echo "b:".($b); ?> <br>
<?php echo "c:"."$c"; ?> <br>
<?php echo "d:"."$d"; ?> <br>
<?php echo "e:"."$e"; ?> <br>
后端页面 connect.php
<?php
$a="1";
$b="2";
$c=$a+$b;
$d=$c+"5";
$e="10"/"3";
?>
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