HOw to make this php class work as expected - php

Question

Can anyone see what i have done incorreclty using this class it should change the word before to after but it just sits there doing nothing.
The second php pgm is the actual classs I am using..
<?php
include("parse.inc.php");
$bob = new parseClass();
$tag = "{Before}";
$replacement = "After";
$content = "My animal runs around all over the place and his name is {Before}.";
$bob->ReplaceTag($tag, $replacement, $content);
echo $bob;
?>
parse.inc.php (file name)
***************************
<?php
Class parseClass {
function ReplaceTag($tag, $replacement, $content) {
$content = str_replace($tag, $replacement, $content);
return $content;
}
}
// END Class parseClass
?>

Answer 1

In your case, you pass the content into class's function
Therefore, you should store the return value into variable first
$result = $bob->ReplaceTag($tag, $replacement, $content);
echo $result;

Answer 2

You just need to store the result of your function in a local variable, and print that.
$result = $bob->ReplaceTag($x, $y, $z);
print($result);

Answer 3

I guess you want to print the string having be replaced,so you should :
$result = $bob->ReplaceTag($tag, $replacement, $content);
echo $result;
Why are you use echo to print class?If you want to do this,please use "var_dump" or 'print_r' instead;

Answer 4

If the hard requirement is that you want to be able to echo the instance of parseClass, try this:
class parseClass
{
private $content;
public function ReplaceTag($tag, $replacement, $content)
{
$this->content = str_replace($tag, $replacement, $content);
}
public function __toString()
{
return $this->content;
}
}
$bob = new parseClass();
$tag = "{Before}";
$replacement = "After";
$content = "My animal runs around all over the place and his name is {Before}.";
$bob->ReplaceTag($tag, $replacement, $content);
echo $bob;
For reference, see:
http://php.net/manual/en/language.oop5.magic.php#object.tostring

Answer 5

Simply replace these two lines
$bob->ReplaceTag($tag, $replacement, $content);
echo $bob;
with
$content = $bob->ReplaceTag($tag, $replacement, $content);
echo $content;