How to check if a PHP array has any value set?

Perhaps empty()?

From Docs:

Return Values

Returns FALSE if var has a non-empty and non-zero value.

The following things are considered to be empty:

"" (an empty string)
0 (0 as an integer)
"0" (0 as a string)
NULL
FALSE
array() (an empty array)
var $var; (a variable declared, but without a value in a class)


if ($signup_errors) {
  // there was an error
} else {
  // there wasn't
}

How does it work? When converting to boolean, an empty array converts to false. Every other array converts to true. From the PHP manual:

Converting to boolean

To explicitly convert a value to boolean, use the (bool) or (boolean) casts. However, in most cases the cast is unncecessary, since a value will be automatically converted if an operator, function or control structure requires a boolean argument.

See also Type Juggling.

When converting to boolean, the following values are considered FALSE:

  • the boolean FALSE itself
  • the integer 0 (zero)
  • the float 0.0 (zero)
  • the empty string, and the string "0"
  • an array with zero elements
  • an object with zero member variables (PHP 4 only)
  • the special type NULL (including unset variables)
  • SimpleXML objects created from empty tags
  • Every other value is considered TRUE (including any resource).

You could also use empty() as it has similar semantics.

Tags:

Php

Arrays

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