Menu
So i have this form.. With 2 fields. "Youtube" and "link" I want to do if you have filled in YouTube, it should do this:
if(!empty($youtube)) {
if ($pos === false) {
echo "Du skal indtaste youtube et URL, som starter med 'http://www.youtube.com/watch?..<br>";
echo "<br> Har du ikke din video på YouTube, skal du ikke udfylde feltet, men kun 'Link' feltet.<br><br>";
echo "<a href='javascript:history.back();'>Gå tilbage</a>";
}
}
This do its job, but i also want to check on the same if(), if nothing in link. So ive did this:
if(!empty($youtube) && empty($link)) {
if ($pos === false) {
echo "Du skal indtaste youtube et URL, som starter med 'http://www.youtube.com/watch?..<br>";
echo "<br> Har du ikke din video på YouTube, skal du ikke udfylde feltet, men kun 'Link' feltet.<br><br>";
echo "<a href='javascript:history.back();'>Gå tilbage</a>";
}
}
But what if i want to check the opposite, if theres something in LINK and nothing in youtube? And if i want to check if theres nothing at all in those two?
534
empty() function in PHP ? The isset() function is an inbuilt function in PHP which checks whether a variable is set and is not NULL. This function also checks if a declared variable, array or array key has null value, if it does, isset() returns false, it returns true in all other possible cases.
To find out if a bash variable is empty: Return true if a bash variable is unset or set to the empty string: if [ -z "$var" ]; Another option: [ -z "$var" ] && echo "Empty" Determine if a bash variable is empty: [[ ! -z "$var" ]] && echo "Not empty" || echo "Empty"
The isNull operator checks a string and returns a boolean value: true if the string is null, or false if the string is not null. The isEmpty operator checks if a string contains no characters and is only whitespace.
An empty array is falsey in PHP, so you don't even need to use empty() as others have suggested. PHP's empty() determines if a variable doesn't exist or has a falsey value (like array() , 0 , null , false , etc).
if(!empty($youtube) && empty($link)) {
}
else if(empty($youtube) && !empty($link)) {
}
else if(empty($youtube) && empty($link)) {
}
Here's a compact way to do something different in all four cases:
if(empty($youtube)) {
if(empty($link)) {
# both empty
} else {
# only $youtube not empty
}
} else {
if(empty($link)) {
# only $link empty
} else {
# both not empty
}
}
If you want to use an expression instead, you can use ?: instead:
echo empty($youtube) ? ( empty($link) ? 'both empty' : 'only $youtube not empty' )
: ( empty($link) ? 'only $link empty' : 'both not empty' );
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
