Replace text when value is not NULL

Question

I want to have the title of the pages that are written in HTML replaced only when I insert a custom title. What function in PHP performs substitutions when the value is not NULL? How can I do this?

Answer 1

Depends on what you call null.

The Stock comment is correct, you simply use the comparison:

if($valor !== null){
   // Substitui porque não está nulo
}else{
   // Está nulo
}

However there is a difference between what is nulo and what is vazio, you can use the '' to identify the void.

if($valor !== ''){
   // Substitui porque não está vazio
}else{
   // Está vazio
}

In all cases, to identify if the value is not empty and also not null you can use the non restrictive comparators != instead of !== (that is, you can use != null or != "") or you can choose to use the function !empty().

if(!empty($valor)){
   // Substitui porque não está nulo, não está vazio e não está indefinido
}else{
   // Está "nulo"
}

You can see the null and also empty comparison table by clicking here.