Boolean type forced on string assignment inside if statement

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To: php-general <php-general@xxxxxxxxxxxxx>
Subject: Boolean type forced on string assignment inside if statement
From: Marc Guay <marc.guay@xxxxxxxxx>
Date: Wed, 2 Jan 2013 10:53:39 -0500

Hi folks,

if ($a = "foo" && $b = "bar"){
    echo $a."<br />".$b;
}

Returns:
1
bar

I expect:
foo
bar

Is this documented?

Marc

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