Replace text when the value is not NULL [closed]

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Replace text when the value is not NULL [closed]

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#1 by (4 votes)

-5

I want to make the title of the pages that are written in HTML be overwritten only when I insert a custom title. What function in PHP does overrides when the value is not NULL? How can I do this?

php

asked by anonymous 15.09.2016 / 08:45

1 answer

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score 4 · Answer 1

Depends on what it calls null.

Bacco's 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 '' 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 !empty() function.

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

You can see the null comparison table as well as the empty table by clicking here.