In PHP 5.0.0, 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. Built from https://develop.svn.wordpress.org/trunk@31188 git-svn-id: http://core.svn.wordpress.org/trunk@31169 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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@@ -260,7 +260,7 @@ function wp_mail( $to, $subject, $message, $headers = '', $attachments = array()
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global $phpmailer;
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// (Re)create it, if it's gone missing
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if ( !is_object( $phpmailer ) || !is_a( $phpmailer, 'PHPMailer' ) ) {
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if ( ! ( $phpmailer instanceof PHPMailer ) ) {
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require_once ABSPATH . WPINC . '/class-phpmailer.php';
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require_once ABSPATH . WPINC . '/class-smtp.php';
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$phpmailer = new PHPMailer( true );
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