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php之数组字符串大全-->0418
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实例

<?php
/**
 * Created by PhpStorm.
 * User: Administrator
 * Date: 2018/4/19 0019
 * Time: 上午 10:27
 */
header("content-type:text/html;charset=utf-8");
/**
 * 数组排序
 */
$arr = array(1, 2, 3, 4, 0, -1);
/**
 * 依据值排序
 */
$arr = array(1, 2, 3, 4, 0, -1);
asort($arr, SORT_REGULAR);// 由低到高 索引不变

echo "<pre>";
print_r($arr);
echo "</pre>";
echo "asort<hr>";

$arr = array(1, 2, 3, 4, 0, -1);
arsort($arr, SORT_REGULAR);// 由高到低 索引不变
echo "<pre>";
print_r($arr);
echo "</pre>";
echo "arsort<hr>";

$arr = array(1, 2, 3, 4, 0, -1);
sort($arr, SORT_REGULAR);//由高到低 此函数为 array 中的元素赋与新的键名。这将删除原有的键名,而不是仅仅将键名重新排序。
echo "<pre>";
print_r($arr);
echo "</pre>";
echo "sort<hr>";

//ksort()// 由低到高 依据key排序的 //排序都是 根据 ascii码表 内部 顺序依次排序的
$arr = array("name" => "qq", "age" => 12, "sex" => "男", "身高" => 175, "存款" => "100w");
ksort($arr);
echo "<pre>";
print_r($arr);
echo "</pre>";
echo "ksort<hr>";

//krsort()//索引保持由高到低 依据key排序的 //排序都是 根据 ascii码表 内部 顺序依次排序的
$arr = array("name" => "qq", "age" => 12, "sex" => "男", "身高" => 175, "存款" => "100w");
krsort($arr);
echo "<pre>";
print_r($arr);
echo "</pre>";
echo "krsort<hr>";

echo "<br>";
echo "<br>";
echo "<br>";
/**
 * 数组转化为字符串
 */
$str = implode(",",$arr);
echo $str."<br>";
echo "implode <hr>";
/**
 * 字符串长度计算
 */

$str = "sss,455,4782,4ojhhhh,ouyio,ytwiure,oioiioer,iuwieuriw,oweirwiherw,qqqqq";
$strlength = strlen($str);
echo "str_length=" . $strlength;
echo "strlen<hr>";

/**
 * 字符串转化数组 根据固定长度拆分数组
 */
$strArray = str_split($str, 3);
echo "<pre>";
print_r($strArray);
echo "</pre>";
echo "str_split<hr>";

/**
 * 字符串根据固定字段拆分数组
 */
$strArray = explode(",", $str);
echo " <pre>";
print_r($strArray);
echo "</pre> ";
echo "explode <hr>";
/**
 * 字符串替换
 */
$strReplace = str_replace("45","《-》",$str);
echo $strReplace."<br>";
echo "str_replace<hr>";
$strReplace = str_ireplace("ss","《--》",$str);
echo $strReplace."<br>";
echo "str_ireplace<hr>";
/**
 * 查询一个字符串位置
 */
$strPos = strpos($str,"ouyio");
echo $strPos."<br>";
echo "str_ireplace<hr>";

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