How to check if variable is array?… or something array-like

by

If you are using foreach inside a function and you are expecting an array or a Traversable object you can type hint that function with: 

function myFunction(array $a)
function myFunction(Traversable)

If you are not using foreach inside a function or you are expecting both you can simply use this construct to check if you can iterate over the variable:

if (is_array($a) or ($a instanceof Traversable))

More Related Contents:

  1. How to make array inside in foreach loop – php? [closed]
  2. Can't echo items from array
  3. PHP Foreach returns separated(individual) arrays
  4. Strange behavior Of foreach
  5. Two arrays in foreach loop
  6. Modify array values in foreach loop
  7. PHP foreach change original array values [duplicate]
  8. Performance of FOR vs FOREACH in PHP
  9. How can I loop through two arrays at once? [duplicate]
  10. How to access mysql result set data with a foreach loop
  11. How do you remove an array element in a foreach loop?
  12. Strange behavior of foreach when using reference: foreach ($a as &$v) { … }
  13. PHP foreach with Nested Array?
  14. Foreach loop inside array
  15. How to delete object from array inside foreach loop?
  16. What is better in a foreach loop… using the & symbol or reassigning based on key?
  17. Unsetting array values in a foreach loop [duplicate]
  18. How to access first level keys of a 2d array with a foreach loop? [duplicate]
  19. PHP: Get the key from an array in a foreach loop [duplicate]
  20. case-insensitive array_unique
  21. While destructuring an array, can the same element value be accessed more than once?
  22. php multidimensional array get values
  23. foreach with three variables add
  24. Split a comma-delimited string into an array?
  25. Implode an array with “, ” and add “and ” before the last item
  26. PHP sort array by two field values [duplicate]
  27. PHP order array by date? [duplicate]
  28. PHP: Split string into array, like explode with no delimiter
  29. Group array values based on key in php? [duplicate]
  30. How to create multi-dimensional array from a list?

Leave a Comment