php5 : Testing for null string

[KiwiDexter]

What is the php equiv of the following test for a null string value

$value = somefuntion($A, $B)

if not($value) then
   * string is empty do processing
else
   * string has a value rock on dude
end

TIA and go Fiji this evening ....

[kows]

are you testing for a null value, or an empty string?

if(empty($value)){
  // this value is an empty string -- ""
}else{
  // this value is not an empty string
} 

if(is_null($value)){
  // this value == null
}else{
  // this value != null
} 

if($value === ""){
  // $value is exactly equal to an empty string ("")
}else{
  // $value is not an empty string
} 

if($value === null){
  // $value is exactly equal to null
}else{
  // $value is not null
} 

you should be alright using empty() to test for an empty string and is_null() to test for a null value.

[KiwiDexter]

Think empty() looks like what I'm after. Will test him out this morning and see how I go