我一直在尝试设置此代码以删除 mysql 数据库上的一行以及与它一起上传的照片。删除行数据效果很好，但它不会删除照片，我无法弄清楚我做错了什么。为简化起见，我使用变量 $id ，它是在触发此 php 文件的表单中输入的行号：
<?php
$host="localhost"; // Host name
$username="blahblah_plans"; // Mysql username
$password="password"; // Mysql password
$db_name="blahtbl_name"; // Database name
$tbl_name="plans"; // Table name
// Connect to server and select databse.
$conn = mysql_connect("$host", "$username", "$password")or die("cannot connect");
mysql_select_db("$db_name")or die("cannot select DB");
// get value of id that sent from address bar
$id=$_GET['idnum'];
$compositesql="SELECT composite FROM plans WHERE ID ='$id'";
$compositeresult = mysql_query($compositesql) or die(mysql_error());
$compositefilename = "/composite/" + $compositeresult;
$unlink = unlink($compositefilename);
if($unlink) {
echo 'Successfully deleted file: ';
echo $compositefilename;
} else {
echo 'Error deleting file: ';
echo $compositefilename;
}
// Delete data in mysql from row that has this id
$sql="DELETE FROM $tbl_name WHERE ID ='$id'";
$result = mysql_query($sql);
if($result){
header("location:planentry.php");
}
else {
echo "ERROR";
}
?>
<?php
// close connection
mysql_close();
?>