$string .= '<>add something extra.';
}
$str = 'This is a string!';
add_some_extra($str);
echo $str;
?>
<!--在函数中使用默认参数-->
<?php
function makecoffee1($type = "cappuccino")
{
return "Making a cup of {$type}.\n";
}
echo makecoffee1();
echo makecoffee1(null);
echo makecoffee1("xudedong"), "<BR>";
?>
<!--PHP 还允许使用数组 array 和特殊类型 NULL 作为默认参数，使用非标量类型作为默认参数,
默认值必须是常量表达式，不能是诸如变量，类成员，或者函数调用等。-->
<?php
function makecoffee($types = array("aaaaa"), $coffeeMaker = NULL)
{
$device = is_null($coffeeMaker) ? "null" : "hands,{$coffeeMaker}";
return "Making a cup of " . join(",", $types) . " with {$device}.\n";
}
echo makecoffee(), "<BR>";
echo 1.111111111111111E+27, "<BR>";
echo makecoffee(array("aaaaa", "bbbbb", "ccc"), 'ttt');
?>
<?php
define("BR", "</br>");
function add_some_extra(&$string)
{
$string .= 'и кое-что еще.';
}
$str = 'Это строка, ';
add_some_extra($str);
echo $str;
// выведет 'Это строка, и кое-что еще.'
echo BR;
function makecoffee1($type = "капуччино")
{
return "Готовим чашку {$type}.\n";
}
echo makecoffee1();
echo makecoffee1(null);
echo makecoffee1("эспрессо");
echo BR;
function makecoffee($types = array("капуччино"), $coffeeMaker = NULL)
{
$device = is_null($coffeeMaker) ? "вручную" : $coffeeMaker;
return "Готовлю чашку " . join(", ", $types) . " {$device}.\n";
}
echo makecoffee();
echo makecoffee(array("капуччино", "лавацца"), "в чайнике");