php基础知识(四)数组

<?php
header("content-type:text/html;charset=gbk");
printf("<h1>php数组</h1>");

$ary =array("12",'3d','fs3');
//Array
echo $ary.'<br>';

//格式化后输出 Array ( [0] => 12 [1] => 3d [2] => fs3 )
print_r($ary);
printf($ary.'<br>');
print_r($ary[1]."<br>") ;

//数组有相同元素，覆盖
$a1 = array("1"=>"PHP","1"=>"Perl","2"=>"JAVA","6"=>"Ruby");

print_r($a1);
array_push($a1,"Ruby");
print_r($a1);//Array ( [1] => Perl [2] => JAVA [6] => Ruby [7] => Ruby )
print_r(array_unique($a1));//Array ( [1] => Perl [2] => JAVA [6] => Ruby )

/**
* 关联数组
*/
$glAry =array("o"=>1,"t"=>2,"tr"=>'44r');

print_r($glAry);
echo $glAry["o"];
//向数组中添加元素
$glAry["s"]="ds";
print_r($glAry);

echo '数组元素的个数：'.count($glAry)."<br>";
//搜索元素，找到返回索引值
echo array_search("1", $glAry).'<br>';//o
//取数组中最后一个元素
echo   array_pop($glAry).'<br>';//ds
//数组末尾添加元素，返回元素的索引
echo array_push($glAry,'refre').'<br>';//4
print_r($glAry);//Array ( [o] => 1 [t] => 2 => 44r [0] => refre )

echo '<h2>二维数组</h2><br>';
/**
* 二维数组的定义
*/
$tAry = array(array("3","43","f4"),array("32","f3",'php'));
print_r($tAry);
echo '<br>';
foreach ($tAry as $i){
foreach ($i as $j){
echo $j;
}
echo "<br>";
}

echo '数组元素的总个数:'.count($tAry,COUNT_NORMAL).'<BR>';//2
echo '数组元素的总个数:'.count($tAry,COUNT_RECURSIVE).'<BR>';//8

/**
* 将字符串转化为数组
* explode();
*/
$str ="i , love ,you";
//Array ( [0] => i , love ,you )
print_r(explode(".", $str));

//Array ( [0] => i [1] => love ,you )
print_r(explode(",", $str,2));

// Array ( [0] => i [1] => love [2] => you )
print_r(explode(",", $str));
/**
* 将数组转化为字符串
*/
$strT = implode(",", $a1);
echo $strT;