php详细学习1

PHP中的引用

$a="now magic";
$b=&$a;
$b="abc";
echo $b.$a;

结果：abcabc

$a="now magic";
$b=$a;
$b="abc";
echo $b.$a;

结果：abcnowmagic

function test(&$a){
    $a+=100;
}
$b=1;
test($b);
echo $b;

结果：101

function test($a){
    $a+=100;
}
$b=1;
test($b);
echo $b;

结果1