php echo link including php variable

peterpann · Jul 27, 2017

How can php write a link to call a javascript function which uses a php variable ?
In this simple example I want the alert box to show the value (222) of the variable, but I cannot get beyond result1 showing the alert with "$myvar", or
result2 showing the alert with the variable but without a link.

<?php
$myvar = "222";

$link = 'alert("$myvar")';
$result1 = "";
$result1 .= "<a href='javascript:";
$result1 .= $link;
$result1 .= " '>";
$result1 .= $link;
$result1 .= "</a>";

$result2 = "";
$result2 .= "<script type='text/javascript'>";
$result2 .= "alert('$myvar');";
$result2 .= "</script>";
?>

<html>
<head>
</head>
<body>

<?php
echo $result1;
echo $result2;
?>

</body>
</html>

feherke · Jul 27, 2017

Hi

Let us cut the complications for now :

PHP:

[teal]<?php[/teal]
[navy]$myvar[/navy] [teal]=[/teal] [i][green]"s'p\"e<c&i;a>l"[/green][/i][teal];[/teal]
[teal]?>[/teal]
[b]<html>[/b]
[b]<head>[/b]
[b]</head>[/b]
[b]<body>[/b]
[b]<a[/b] [maroon]href[/maroon][teal]=[/teal][i][green]"javascript:alert(<?=htmlentities(json_encode($myvar))?>)"[/green][/i][b]>[/b]Huh ?[b]</a>[/b]
[b]</body>[/b]
[b]</html>[/b]

Note that you can [tt]alert()[/tt] a number without much care, but if that value could ever contain something else than digits, better encode it properly.

Feherke.
feherke.github.io

peterpann · Jul 31, 2017

Thanks feherke. I guessed it would be you who came to my rescue.

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php echo link including php variable

peterpann

Programmer

feherke

Programmer

peterpann

Programmer

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