一、概述
本节课讲述了while与do while、函数的参数、数组键值常见操作和指针、堆栈操作。
二、作业
1、while和do while以及函数部分
实例
<?php
echo '<h4 style="color : gold">有参数的函数</h4>';
function hello(){
return 'Hello~';
}
function hello2($name,$age,$country='CHINA'){
echo hello();
return 'I\'m '.' '.$name.'.<br>'.'I\'m '.$age.'.<br>'.'I come from '.$country.'.<br>';
}
echo hello2(Mike,19),'<hr>';
echo '<h4 style="color : red">无参数的函数</h4>';
function hello3(){
echo hello();
return 'I\'m '.' '.func_get_arg(0).'.<br>'.
'I\'m '.func_get_arg(1).
'.<br>'.'I come from '.func_get_arg(2).'.<br>';
}
echo hello3(Jack,20,USA),'<hr>';
echo '<h4 style="color : coral">全局变量不可以直接调用</h4>';
$no=9981;$school='school';
function get_School(){
global $no;
return 'I am in '.$no.$GLOBALS['school'];
}
echo get_school(),'<br>';
echo '<h4 style="color : gold">while和do while</h4>';
$i=1;
while ($i<3){
// if ($i<2){
// echo hello3(Jack,20,USA),'<br>';
// }
// if ($i==2){
// echo hello2(Mike,19);
// }
echo $i<2 ? hello3(Jack,20,USA).'<br>' : hello2(Mike,19);
$i++;
}
echo '<hr>';
$i=1;
do{
echo $i<2 ? hello3(Jack,20,USA).'<br>' : hello2(Mike,19);
}while(i<0);运行实例 »
点击 "运行实例" 按钮查看在线实例
截图：
2、数组和堆栈
实例
<?php
echo '<h4 style="color : gold">键值对</h4>';
$std=['id'=>5,'name'=>mike,'class'=>9,'grade'=>3];
echo '<pre>',print_r($std,true),'</pre>';
echo '<hr>';
echo in_array('mike',$std) ? '有':'无';
echo '<hr>';
echo array_key_exists('name',$std) ? '有':'无';
echo '<hr>';
echo '<pre>',print_r(array_values($std),true),'</pre>';
echo '<hr>';
echo '<pre>',print_r(array_keys($std),true),'</pre>';
echo '<hr>';
$key2 = array_search('mike',$std);
echo $key2,'<br>';
echo $std[$key2];
echo '<h4 style="color : gold">指针</h4>';
$school=['id'=>5,'name'=>A,'class'=>9,'grade'=>3];
echo '<pre>',print_r($school,true),'</pre>';
echo '当前元素数目',count($school),'<br>';
echo '当前key',key($school),'<br>';
echo '当前值',current($school),'<br>';
next($school);
echo '指针下移动，当前key',key($school),'<br>';
echo '当前值',current($school),'<br>';
reset($school);
echo '数组重置，当前key',key($school),'<br>';
echo '当前值',current($school),'<br>';
end($school);
echo '指针移动最后，当前key',key($school),'<br>';
echo '当前值',current($school),'<br>';
reset($school);
echo '<pre>','返回当前元素的键值的索引与关联的描述,并自动下移',
print_r(each($school),true),'</pre>';
reset($school);
list($key0,$value0) = each($school);
echo $key0,'-----',$value0,'<br>';
list($key0,$value0) = each($school);
echo $key0,'-----',$value0,'<br>';
list($key0,$value0) = each($school);
echo $key0,'-----',$value0,'<br>';
list($key0,$value0) = each($school);
echo $key0,'-----',$value0,'<br>';
list($key0,$value0) = each($school);
echo $key0,'-----',$value0,'<hr>';
reset($school);
echo '遍历数组','<br>';
while (list($key0, $value0) = each($school)) {
echo $key0 , ' => ', $value0, '<br>';
}
echo '<h4 style="color : gold">堆栈和队列</h4>';
reset($school);
echo '<pre>',print_r($school,true),'</pre>';
echo count($school),'<br>';
echo array_push($school,location),'<br>';
echo count($school),'<br>';
echo '<pre>',print_r($school,true),'</pre>';
echo array_pop($school),'<br>';//删除最后一个元素
echo array_pop($school),'<br>';
echo array_pop($school),'<br>';
echo '<pre>',print_r($school,true),'</pre>';
reset($school);
echo '<pre>',print_r($school,true),'</pre>';
echo array_unshift($school,'class','grade');
echo '<pre>',print_r($school,true),'</pre>';
echo array_shift($school);
echo '<pre>',print_r($school,true),'</pre>';
echo '<h4 style="color : gold">尾进头出</h4>';
array_push($school,'no');
echo '<pre>',print_r($school,true),'</pre>';
array_shift($school);
echo '<pre>',print_r($school,true),'</pre>';
echo '<h4 style="color : gold">头进尾出</h4>';
array_unshift($school,'class');
echo '<pre>',print_r($school,true),'</pre>';
array_pop($school);
echo '<pre>',print_r($school,true),'</pre>';
echo '<br><br><br><br><br><br><br><br><br>';运行实例 »
点击 "运行实例" 按钮查看在线实例
截图：
三、总结
本节课内容基本掌握，明白了用法，对基础能力进一步夯实，数组部分只做到了看到会明白是什么意思，入栈和出栈操作只需记忆即可。
