PHP功能建议

Question

any advice would be helpful, thank you

i'm trying to clean a piece of html tags with contents but for some reason it's not working properly

<?php

function cleaning($vclean)
{
$vclean = strip_tags($vclean);
$vclean = rtrim($vclean);
$vclean = trim($vclean);

$vclean = str_replace("  ", "", $vclean);
$vclean = preg_replace('/\s\s+/', ' ', $vclean);
$vclean = str_replace("'", "", $vclean);

echo "function is cleaning<br>";

}


cleaning($any_variable);


?>

Answer 1

Is this what you were intending:

<?php

function cleaning($vclean)
{
$vclean = strip_tags($vclean);
$vclean = rtrim($vclean);
$vclean = trim($vclean);

$vclean = str_replace("  ", "", $vclean);
$vclean = preg_replace('/\s\s+/', ' ', $vclean);
$vclean = str_replace("'", "", $vclean);

return $vclean;

}


echo cleaning("function is cleaning<br>");


?>

Answer 2

Perhaps you are expecting the function to clean the original variable?

Like:

$variable = '<p>foobar</p>';
cleaning($variable);
echo $variable;

This does not work, because the function cannot 'see' or change a variable that is declared outside the function. Because of that, you will see the old value of $variable, not the cleaned one.

If this is the case, you should read about Variable scopes

As for the practical solution, you should return the cleaned variable in the end of the function, and do the following:

$variable = '<p>foobar</p>';
$variable = cleaning($variable);
echo $variable;