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is_a() became deprecated in favour of the instanceof operator. Calling is_a() would result in an E_STRICT warning.
In PHP 5.3.0, `is_a()` is no longer deprecated, and will therefore no longer throw `E_STRICT` warnings. To avoid warnings in PHP < 5.3.0, convert all `is_a()` calls to `$var instanceof WP_Class` calls. `instanceof` does not throw any error if the variable being tested is not an object, it simply returns `false`. Props markoheijnen, wonderboymusic. Fixes #25672. git-svn-id: https://develop.svn.wordpress.org/trunk@31188 602fd350-edb4-49c9-b593-d223f7449a82
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