I need the title of the page to vary according to the form, for this I used the code inside <head> :
<?php
$titulo = isset($_POST['titulo']) ? $_POST['titulo'] : 'Sem titulo';
?>
<title><?php echo $titulo." - Minimalist";?></title>
It works fine if I add the title in the form, but it does not return the 'Untitled', when it is empty. This worked fine with $_GET . By chance, when using $_POST , does it return an empty string ?
The isset checks if a variable has been defined / initialized, is not checked if it has a value.
isset will always return true to $_POST because it goes always be defined, but it may be empty, which is probably the source of your problem.
See the $_POST documentation:
This is a superglobal , or global automatic, variable. This simply means that it is available in all scopes by the script .
To check if the variable is empty, use empty :
$titulo = empty($_POST['titulo']) ? 'Sem titulo' : $_POST['titulo'];
Similar to isset , empty also checks if the variable has been initialized, but does not issue a warning . What is considered empty by empty :
"" (an empty string ) 0 ( 0 as an integer) 0.0 ( 0 as a floating point) "0" ( 0 as a string ) NULL FALSE array() (a% empty%) array (a declared variable, but no value) According to the documentation , $var; is essentially equivalent to empty .
Another alternative is to use !isset($var) || $var == false and a condition to check if variable is not empty:
$titulo = isset($_POST['titulo']) && $_POST['titulo'] !== '' ?
$_POST['titulo'] : 'Sem titulo';
See also:
isset , null , 0 and empty