<?php
function increment($val)
{
return ++$val;
}
$val = 1;
echo increment($val) . PHP_EOL;
echo "Function 2:" . PHP_EOL;
function increment2($val)
{
return $val++;
}
$val = 1;
echo increment2($val) . PHP_EOL;
$var = "contents 1";
fn();
echo "outside the function, \$var = " . $var . "<br/>";
function fn2()
{
global $var;
$var = "contents";
echo "inside the function, \$var = " . $var . "<br/>";
}
fn2();
echo "outside the function, \$var = " . $var . "<br/>";
/*未改变原变量的引用*/
function increment1($value, $amount = 1)
{
$value = $value + $amount;
}
echo "without '&': <br/>";
$a1 = 10;
echo $a1 . "<br/>";
increment1($a1);
echo $a1 . "<br/>";
/*引用传递参数*/
function increment2(&$value, $amount = 1)
{
$value = $value + $amount;
}
echo "with '&': <br/>";
$a2 = 10;
echo $a2 . "<br/>";
increment2($a2);
echo $a2 . "<br/>";
