Determine if all the values in a PHP array are null
I m looking for the most performance friendly approach to check if all values in an array are null or if it at least has one element with other types i e i need a method called containsOnlyNull array which returns booleans according to the passed array e g
PHP is array Manual, Description is array mixed value bool Finds whether the given variable is an array Parameters value The variable being evaluated Return Values Returns true if value is an array false otherwise Examples Example 1 Check that variable is an array php yes array this is an array echo is array yes
PHP in array Manual
Description in array mixed needle array haystack bool strict false bool Searches for needle in haystack using loose comparison unless strict is set Parameters needle The searched value Note If needle is a string the comparison is done in a case sensitive manner haystack The array strict
PHP is null Manual, Description is null mixed value bool Finds whether the given variable is null Parameters value The variable being evaluated Return Values Returns true if value is null false otherwise Examples Example 1 is null example php error reporting E ALL foo NULL var dump is null inexistent is null foo
PHP array key exists Manual
PHP array key exists Manual, Array key existsChecks if the given key or index exists in the array array key exists array key exists is set in the array can be any value possible for an array index array key exists will search for the keys in the first dimension only Nested keys in multidimensional arrays will not be found array key exists
Check And Declare Empty Array In Java Scaler Topics
PHP array diff Manual
PHP array diff Manual Array diff A B returns all elements from A which are not elements of B A without B You should include this in the documentation more precisely I think If you want to account for keys use array diff assoc instead and if you want to remove empty values use array filter
How To Check Null In Java
Determine if a variable is considered set this means if a variable is declared and is different than null If a variable has been unset with the unset function it is no longer considered to be set isset will return false when checking a variable that has been assigned to null PHP isset Manual. Check whether a variable is NULL or not php a 0 echo a is is null a br b null echo b is is null b br c null echo c is is null c br d NULL echo d is is null d br Try it Yourself Definition and Usage The is null function checks whether a variable is NULL or not Inside this callback function we will check if a element passed as second argument is null or not If it is null then return true otherwise it returns false Also if the first argument is false then it will always return false only without checking the value of second element In the end the array reduce function returns true if all
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