我在我的网站中加入了搜索功能，可以搜索特定邮政编码和选定半径内的所有组织。这部分效果很好。我现在也在尝试合并类别搜索，因此它不仅搜索选定的 zip 距离内的所有组织，还搜索选定的 zip 距离内的选定类别中的所有组织。但是，我收到以下错误：
致命错误：在第 104 行调用 C:\xampp\htdocs\caretest\include\header.php 中未定义的函数 preg__match()
我很确定这可能是由于我的 if 语句中对 preg_match 函数的某种滥用，但是我不确定如何正确使用它来使其工作，或者是否有更好的方法来做到这一点不涉及 preg_match 也可以。谢谢。
这是代码：
<?php include('./Connections/ecsdb.php'); ?>
<script type="text/JavaScript">
function MM_goToURL() { //v3.0
var i, args=MM_goToURL.arguments; document.MM_returnValue = false;
for (i=0; i<(args.length-1); i+=2) eval(args[i]+".location='"+args[i+1]+"'");
}
</script>
<?php
mysql_select_db($database_ecsdb, $ecsdb);
$query_getCat = "SELECT DISTINCT category FROM food ORDER BY category DESC";
$getCat = mysql_query($query_getCat, $ecsdb) or die(mysql_error());
$row_getCat = mysql_fetch_assoc($getCat);
$totalRows_getCat = mysql_num_rows($getCat);
?>
<a name="top" id="top"></a>
<div style="float:right;">
<?php
$my_loginbutton = "<input name=\"toLogin\" type=\"button\" onclick=\"MM_goToURL('parent','./login/');return document.MM_returnValue\" value=\"Login\" />";
$my_logoutbutton = "<input name=\"Logout\" type=\"button\" onclick=\"MM_goToURL('parent','./login/logout.php');return document.MM_returnValue\" value=\"Logout\" />";
if (isset($_SESSION['MM_Username']))
echo $my_logoutbutton;
else
echo $my_loginbutton;
?>
</div>
<div id="header" >
<div style="float:left;"><img name="Alpha Accounting logo" src="./images/banner.png" width="800" height="140" border="0" alt="Alpha Accounting"></div>
<div style="margin: 10px 0 0 5px; float:left;"></div>
<div id="search">
<h2> Search for Organizations</h2>
<br>
<form action="../caretest/search.php" method="post">
<label name="category">
Category:
<select name="category">
<?php
do {
?>
<option value="<?php echo $row_getCat['category']?>"><?php echo $row_getCat['category']?></option>
<?php
} while ($row_getCat = mysql_fetch_assoc($getCat));
$rows = mysql_num_rows($getCat);
if($rows > 0) {
mysql_data_seek($getCat, 0);
$row_getCat = mysql_fetch_assoc($getCat);
}
?>
</select>
</label>
<label>Enter your ZIP Code:
<input maxlength="5" name="zipcode" size="6" type="text" /></label> </br>
<label>Select a distance:</label>
<select name="distance">
<option>5</option>
<option>10</option>
<option>25</option>
<option>50</option>
<option>100</option>
</select>
<input name="submit" type="submit" value="search" />
</form>
<?php
if(isset($_POST['submit'])) {
//if(!preg__match('/w', $_POST['category'])){
// echo "<p><strong>You must select a category. </strong> Please try again.</p>\n";
//}
if(!preg_match('/^[0-9]{5}$/', $_POST['zipcode'])) {
echo "<p><strong>You did not enter a properly formatted ZIP Code.</strong> Please try again.</p>\n";
}
elseif(!preg_match('/^[0-9]{1,3}$/', $_POST['distance'])) {
echo "<p><strong>You did not enter a properly formatted distance.</strong> Please try again.</p>\n";
}
else {
//connect to db server; select database
$link = mysql_connect($hostname_ecsdb, $username_ecsdb, $password_ecsdb) or die('Cannot connect to database server');
mysql_select_db($database_ecsdb) or die('Cannot select database');
//query for coordinates of provided ZIP Code
if(!$rs = mysql_query("SELECT * FROM zip WHERE zip_code = '$_POST[zipcode]'")) {
echo "<p><strong>There was a database error attempting to retrieve your ZIP Code.</strong> Please try again.</p>\n";
}
else {
if(mysql_num_rows($rs) == 0) {
echo "<p><strong>No database match for provided ZIP Code.</strong> Please enter a new ZIP Code.</p>\n";
}
else {
//if found, set variables
$row = mysql_fetch_array($rs);
$lat1 = $row['latitude'];
$lon1 = $row['longitude'];
$d = $_POST['distance'];
$r = 3959;
//compute max and min latitudes / longitudes for search square
$latN = rad2deg(asin(sin(deg2rad($lat1)) * cos($d / $r) + cos(deg2rad($lat1)) * sin($d / $r) * cos(deg2rad(0))));
$latS = rad2deg(asin(sin(deg2rad($lat1)) * cos($d / $r) + cos(deg2rad($lat1)) * sin($d / $r) * cos(deg2rad(180))));
$lonE = rad2deg(deg2rad($lon1) + atan2(sin(deg2rad(90)) * sin($d / $r) * cos(deg2rad($lat1)), cos($d / $r) - sin(deg2rad($lat1)) * sin(deg2rad($latN))));
$lonW = rad2deg(deg2rad($lon1) + atan2(sin(deg2rad(270)) * sin($d / $r) * cos(deg2rad($lat1)), cos($d / $r) - sin(deg2rad($lat1)) * sin(deg2rad($latN))));
//find all coordinates within the search square's area
//exclude the starting point and any empty city values
$query = "SELECT * FROM zip WHERE (latitude <= $latN AND latitude >= $latS AND longitude <= $lonE AND longitude >= $lonW) AND (latitude != $lat1 AND longitude != $lon1) AND city != '' ORDER BY state, city, latitude, longitude";
if(!$rs = mysql_query($query)) {
echo "<p><strong>There was an error selecting nearby ZIP Codes from the database.</strong></p>\n";
}
elseif(mysql_num_rows($rs) == 0) {
echo "<p><strong>No nearby ZIP Codes located within the distance specified.</strong> Please try a different distance.</p>\n";
}
else {
//output all matches to screen
echo"<br />";
echo"<br />";
//echo "<h2> Organization Search Results</h2>";
echo "<table class=\"bordered\" cellspacing=\"0\">\n";
echo"<tr><th></th></tr>\n";
echo "<h2> Organization Search Results</h2>";
echo"<tr><th></th></tr>\n";
echo "<tr><th>Agency</th><th>Telephone</th><th>Hours</th><th>Street Address</th><th>City</th><th>State</th><th>Zip</th><th>Website</th><th>Directions</th></tr>\n";
while($row = mysql_fetch_array($rs)) {
//search for matching zip codes in the organization table
if(!$rt = mysql_query("SELECT * FROM food WHERE zip = '$row[zip_code]'")){
echo "<p>Didn't work, try again!</p>";
}
else{
while($rowt = mysql_fetch_array($rt)) {
//output results
echo "<tr><td>$rowt[Agency]</td><td>$rowt[Telephone]</td><td>$rowt[Hours]</td><td>$rowt[street_address]</td><td>$rowt[city]</td><td>$rowt[state]</td><td>$rowt[zip]</td><td>$rowt[website]</td><td>";
echo "</td></tr>\n";
}
}
}
echo "</table>\n<br />\n";
}
}
}
}
}
?>
</div>