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$ar = array("PHP", "CGI", "JAVA", "PERL");
array_shift($ar);
print_r($ar);
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// ­¡ //
$ar = array(5 => "PHP", 4 => "CGI", 3 => "JAVA");
array_shift($ar);
print_r($ar);

// ­¢ //
$ar = array("PHP" => "CGI", "JAVA" => "PERL");
array_shift($ar);
print_r($ar);