php函数形参传值与传引用

传值

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function example( $m ){

    $m = $m * 5 + 10;

    echo "在函数内：\$m = ".$m;

}

$m = 1;

example( $m ) ;  

echo "<p>在函数外：\$m = $m <p>" ; 

传引用

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function example( &$m ){
$m = $m * 5 + 10;
echo "在函数内：\$m = ".$m;
}
$m = 1;
example( $m ) ;
echo "<p>在函数外：\$m = $m <p>" ;