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Editorial Team
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Asked: 2026-06-08T10:56:46+00:00

I have both PHP and HTML in one file, following the pattern: -HTML1 -PHP1

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I have both PHP and HTML in one file, following the pattern:

-HTML1
-PHP1
-HTML2
<-script>
-PHP2
<-/script>
-rest of HTML

In the PHP2 section, I call a function in PHP1 which returns an array.
I can get a value for count($arr), but I cannot print the values in the array. It simply shows as an empty string when I examine the source code in the browser.

When I copy the statements in the function from PHP1 to PHP2, everything works – I can print the values of the array.

Code follows:

<?
include('pathdata.php');
function getThePath($node1, $node2){ //pass strings

    $n1 = $matchIDtoNum[$node1]; //get int (from pathdata)
    $n2 = $matchIDtoNum[$node2];

    $res = array();
    $res[0] = $n1;
    $res[1] = $n2;

    return $res;

}


$node1='';
$node2='';
if($_GET["node1"]){
    $node1 = $_GET["node1"];
}

if($_GET["node2"]){
    $node2 = $_GET["node2"];
}

if ($node1!='' && $node2!=''){
$arr = getThePath($node1,$node2);
}


?>

<html>
<head><title>Paths</title>    
<script>

function init(){

<?    
echo ("document.getElementById('msg1').innerHTML = 'test';\n");
if($node1!='' && $node2!=''){

    //$n1 = $matchIDtoNum[$node1];
    //$n2 = $matchIDtoNum[$node2];      
    //$res = array();
    //$res[0] = $n1;
    //$res[1] = $n2;    
    //$arr=$res;

    $num = count($arr);
    $str = implode(' ', $arr); 

    echo ("document.getElementById('msg1').innerHTML = '$arr[0]';\n"); //Empty string
    echo ("document.getElementById('msg2').innerHTML = '$str';\n"); //String with one space character
    echo ("document.getElementById('msg3').innerHTML = '$num'+' '+'$node1'+' '+'$node2';\n"); //this always works
}

?>

}

</script>


</head>
<body onload="init()">
<h1>Given two Nodes, return Shortest Path</h1>
<form name="inputform" action="getpath.php" method="get">
<input type="text" name="node1" /> 
<input type="text" name="node2" /> 
<input type="submit" value="Submit" />
<input type="reset" value="Clear" />
<br/>
<p id ="msg1"></p>
<p id ="msg2"></p>
<p id ="msg3"></p>
<br/>
</form>
</body>
</html>

Any advice on where I might be going wrong?

Thanks!

Edited to Add: What worked for me was putting global $matchIDtoNum; inside the function. i.e.

function getThePath($node1,$node2){
    global $matchIDtoNum; 
    $n1 = $matchIDtoNum[$nd1];
    //etc
}

This gave the expected output for me.

Thanks to all the commenters and answerers!

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1 Answer

  1. Editorial Team

    Mmm.. on this line:

    $n1 = $matchIDtoNum[$node1]; //get int (from pathdata)

    It seems you want to get an array value from $matchIDtoNum. You can not take a array value from outside of a function, unless you call it as a function. For example like this:

    $n1 = getMatchIDtoNum($node1); // get int (from pathdata)

    and on file pathdata.php there a line like this:

    function getMatchIDtoNum($arg){
      // Your code here
      return $matchIDtoNum[$arg];
}
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