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<?php//post请求//使用$_POST数组接收print_r($_POST);echo '<br>用户输入的邮箱：'.$_POST['email'];echo '<br>用户输入的密码：'.$_POST['password'];?><!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><title>POST传值</title></head><body><form action="" method="post"><label for="email">email:</label><input type="text" name="email" id="email"><label for="password">password:</label><input type="password" name="password" id="password"><button>登陆</button></form></body></html>
<?php//php系统函数//一、字符串函数//1.strtolower() 将字符串转换成小写$a = 'ABcDE';var_dump(strtolower($a)); //string(5) "abcde"echo '<br>';//2.strtoupper()将字符串转换成大写$string = 'abcdE';var_dump(strtoupper($string)); //string(5) "ABCDE"echo '<br>';//3.strlen() 获取字符串长度$string1 = 'afuiabceankjfdsa';var_dump(strlen($string1)); //int(16)echo '<br>';//4.trim() 去除字符串首尾空白字符（或其他字符）$string = " 123123 ";echo trim($string); //123123echo '<br>';var_dump(trim($string)); //string(6) "123123"echo '<br>';//5.ltrim() 去除字符串左边的空白字符（或其他字符）$string = "1234321";var_dump(ltrim($string,'1')); //string(6) "234321"echo '<br>';//6.rtrim() 去除字符串右边的空白字符（或其他字符）$string = "1234321";var_dump(rtrim($string,'1')); //string(6) "123432"echo '<br>';//7.str_replace() 字符串替换$string = "123aaa123";var_dump(str_replace('aaa', '123', $string)); //string(9) "123123123"echo '<br>';//8.strpbrk() 字符串中查找一组字符是否存在...$string = '13701796255';var_dump(strpbrk($string, '18')); //string(11) "13701796255"echo '<br>';//9.explode() 把字符串拆分成数组。$stringArr = 'a b c d e';var_dump(explode(' ', $stringArr)); //array(5) { [0]=> string(1) "a" [1]=> string(1) "b" [2]=> string(1) "c" [3]=> string(1) "d" [4]=> string(1) "e" }echo '<br>';//10.implode() 把数组组合为字符串。$array = ['a','b','c','d','e'];var_dump(implode('', $array)); //string(5) "abcde"echo '<br>';//11.md5() 对字符串进行md5加密$password = '123456';var_dump(md5($password)); //string(32) "e10adc3949ba59abbe56e057f20f883e"echo '<br>';//12.count() 计算数组中元素的数量$arr = ['1','2','3','4','5'];var_dump(count($arr)); //int(5)echo '<br>';//13.array_merge() 合并两个数组$arr2 = ['a','b','c'];var_dump(array_merge($arr,$arr2)); //array(8) { [0]=> string(1) "1" [1]=> string(1) "2" [2]=> string(1) "3" [3]=> string(1) "4" [4]=> string(1) "5" [5]=> string(1) "a" [6]=> string(1) "b" [7]=> string(1) "c" }echo '<br>';//14.in_array() 查询数组中是否存在某值var_dump(in_array('a', $arr)); //bool(false)echo '<br>';var_dump(in_array('a', $arr2)); //bool(true)echo '<br>';//15.sort() 数组的升序排序 对索引数组 成功返回1 失败返回0$arr_sort = ['16','25','32','12.5'];sort($arr_sort);print_r($arr_sort); //Array ( [0] => 12.5 [1] => 16 [2] => 25 [3] => 32 )echo '<br>';//16.rsort() 数组的降序排序rsort($arr_sort);print_r($arr_sort); //Array ( [0] => 32 [1] => 25 [2] => 16 [3] => 12.5 )echo '<br>';//17.array_unique() 移除数组中重复的值 去除之后下标保持不变$array = ['6','6','6','5','4'];$array_unique=array_unique($array);print_r($array_unique); //Array ( [0] => 6 [3] => 5 [4] => 4 )echo '<br>';//18.array_push() 将元素添加到数组的末尾 返回添加后的数组长度array_push($array,'3','2','1');print_r($array); //Array ( [0] => 6 [1] => 6 [2] => 6 [3] => 5 [4] => 4 [5] => 3 [6] => 2 [7] => 1 )echo '<br>';//19.array_pop() 将数组末尾最后一个元素移除 返回被删除元素array_pop($array);print_r($array); //Array ( [0] => 6 [1] => 6 [2] => 6 [3] => 5 [4] => 4 [5] => 3 [6] => 2 )echo '<br>';//20.array_shift() 删除数组开头的元素array_shift($array);print_r($array);echo '<br>';//21.array_unshift() 将元素添加到数组开头array_unshift($array, '0');print_r($array); //Array ( [0] => 0 [1] => 6 [2] => 6 [3] => 5 [4] => 4 [5] => 3 [6] => 2 )
手写：
总结：php中函数有很大作用，需要能灵活运用处理解决问题。函数众多，记是记不完也记不住的，功能具体分为几大类，可以按照功能分类记住一些常用的以提高开发效率。
