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What is use of empty function in PHP?
The empty() function checks whether a variable is empty or not. This function returns false if the variable exists and is not empty, otherwise it returns true.
What is the use of isset () 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.
What is the use of empty function?
Purpose of empty function The PHP empty function is used to determine if a variable is empty or not. It will return True if the given variable is empty and false if it exists or a non-zero or more than zero characters etc.
Is the topic’invalid argument supplied for foreach in’closed?
The topic ‘error Warning: Invalid argument supplied for foreach () in’ is closed to new replies.
Which is the argument passed to foreach ( )?
In the program given above, you can see that the foreach () method is passed the argument $mystring, which is an array. $mystring is converted into an array using the in-built array () method. So, the loop iterates over the array and prints out the elements with space in between them, as mentioned in the code.
How is foreach ( ) used in the conditional statement?
The conditional statement in the second line checks if the variable is an array or not. If it is false, the $mystring is converted into an array using the array () method. Then the foreach () method is used for iterating over the elements of the array and printing them out using the echo statement.
When to use an array instead of a foreach?
When it receives anything other than an array, such as a string if throws the error. In the program given above, you can see that the foreach () method is passed the argument $mystring, which is an array. $mystring is converted into an array using the in-built array () method.