PHP's isset() and arrays
Earlier this week I learned that
isset() behaves a little differently than I had expected when dealing with arrays. Now I already knew that
isset() would return false on a variable not existing, or being set to null. However, I was not expecting it to return false on an array key existing and being set to null.
Show Plain Text
The above example illustrates something that will be confusing and bewildering if you don’t know that
isset() returns false on array keys with null values. My specific case was creating conditionals based on arrays having certain keys regardless of their current value. In the end a workable solution for me was to use
array_key_exists() it will return true regardless of the value assigned to the key.
how using php with “?”….
please tel me examle source
dewa on 1/1/09
How do I using php? plz hlep
Mulleteer on 9/12/10
hello, it seems it returns also false if key exist but is empty, that’s a little strange
dave on 12/2/10
Using array_key_exists() alone is extremely slow. Here is a faster way to determine array element existence
It combines the isset() and array_key_exists() functions, and is reliable and much faster.
Morning on 7/3/11
pradeep on 9/27/12
EH on 7/27/13
I am looking at this, need to say something like
If isset() …
echo “Died In: “,$p->getYearDied();
jessica on 10/25/13