求一个最简单的基础问题
问题1
<br> <?php <br /> $fruits = array <br> ( <br> "prange1", "orange2", "prange3", "orange10" <br> ); <br> sort($fruits, SORT_NUMERIC);//按数字来排序 从小到大 <br> foreach ($fruits as $key => $val) <br> { <br> echo "fruits[" . $key . "] = " . $val . "\n"; <br> } <br> ?> <br>
fruits[0] = orange10
fruits[1] = prange3
fruits[2] = orange2
fruits[3] = prange1 数字是怎么排序 帮忙分析下.....sort 是重小到大排序
问题2
unset($color);unset($size);unset($shape);
unset($xx_color);unset($xx_size);unset($xx_shape);
要释放很多变量, 刚学习 想把它封成函数来调用,但是却变成局部变量 有没有办法
释放几个变量的值 ,需要调用很多次 我只想代码好看 封装起来 有啥办法
回复讨论(解决方案)
// 销毁一个以上的变量
unset($foo1, $foo2, $foo3);
问题1
$fruits 数组中的值都不是数字串,转换成数值后都是 0
一个全 0 的数组已无所谓次序了(虽然效果是数组被翻转了)
问题2
手册云:
如果您想在函数中 unset() 一个全局变量,可使用 $GLOBALS 数组来实现: <?phpfunction foo() { unset($GLOBALS['bar']);}$bar = "something";foo();?>

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