数组排序,转换和替换---4月18日作业

实例

<style type="text/css">
	hr{
		padding: 0px;
		margin: 5px 0px;
		width: 650px;
	}
</style>
<?php
$test=array("JAVA","PHP","HTML","CSS","C++","Mysql");
print_r($test);
echo "<hr>";
sort($test);//sort升序排列
print_r($test);
echo "<hr>";
//sort降序排列
$test=array("JAVA","PHP","HTML","CSS","C++","Mysql");
rsort($test);
print_r($test);
echo "<hr color='gray'>";

$test2=array("Nginx"=>"2","IIS"=>"3","Apache"=>"1");
print_r($test2);
echo "<hr>";
//asort根据值升序排列
asort($test2);
print_r($test2);
echo "<hr>";
//arsort根据值降序排列
$test2=array("Nginx"=>"2","IIS"=>"3","Apache"=>"1");
arsort($test2);
print_r($test2);
echo "<hr>";
//ksort根据键升序排列
$test2=array("Nginx"=>"2","IIS"=>"3","Apache"=>"1");
ksort($test2);
print_r($test2);
echo "<hr>";
//krsort根据键降序排列
$test2=array("Nginx"=>"2","IIS"=>"3","Apache"=>"1");
krsort($test2);
print_r($test2);
echo "<hr color='gray'>";
//长度
echo strlen("  www.php.cn中文网!  ");
echo('<hr color="gray">');
//替换
$test3="www.php.cn!";
echo str_replace("php","html",$test3);
echo '<hr color="gray">';

$test4="hello";
echo('origin: '.$test4.'<br>');
echo('split: ');
print_r(str_split($test4));
echo('<br>split by 2: ');
print_r(str_split($test4,2));
echo '<hr color="gray">';
//分割
$str = 'test1,test2,test3,test4';
echo('origin: '.$str.'<br>');
print_r(explode(',',$str,2));
echo '<br>';
print_r(explode(',',$str,4));
echo '<br>';
print_r(explode(',',$str,-2));
echo '<hr color="gray">';

$str1=array("www",".php.cn");
echo implode("",$str1);