欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  IT编程

解析php中var_dump,var_export,print_r三个函数的区别

程序员文章站 2023-08-18 18:22:34
下面的示例看看这三个函数的具体的区别,其中var_dump和var_export比较少用,但他们两者又很相似。所以可以看看:复制代码 代码如下:
下面的示例看看这三个函数的具体的区别,其中var_dump和var_export比较少用,但他们两者又很相似。所以可以看看:
复制代码 代码如下:

<?php
$a = array(1,1,32,322,3433,array(32,232,23232));
$b = 1234;
$c = "alsdfl;asdf";
$d = 'a';
$e = fopen("slsl.txt", "r");
var_dump($a);
echo "<br>";
var_dump($b);
echo "<br>";
var_dump($c);
echo "<br>";
var_dump($d);
echo "<br>";
var_dump($e);
echo "<br>";
echo "<br>";
echo "<br>";
echo "<br>";
var_export($a);
echo "<br>";
var_export($b);
echo "<br>";
var_export($c);
echo "<br>";
var_export($d);
echo "<br>";
var_export($e);
echo "<br>";
echo "<br>";
echo "<br>";
echo "<br>";
print_r($a);
echo "<br>";
print_r($b);
echo "<br>";
print_r($c);
echo "<br>";
print_r($d);
echo "<br>";
print_r($e);
echo "<br>";

输出:
复制代码 代码如下:

warning: fopen(slsl.txt) [function.fopen]: failed to open stream: no such file or directory in e:\mywww\yangtest\base1.php on line 6
array(6) { [0]=> int(1) [1]=> int(1) [2]=> int(32) [3]=> int(322) [4]=> int(3433) [5]=> array(3) { [0]=> int(32) [1]=> int(232) [2]=> int(23232) } }
int(1234)
string(11) "alsdfl;asdf"
string(1) "a"
bool(false)
array ( 0 => 1, 1 => 1, 2 => 32, 3 => 322, 4 => 3433, 5 => array ( 0 => 32, 1 => 232, 2 => 23232, ), )
1234
'alsdfl;asdf'
'a'
false
array ( [0] => 1 [1] => 1 [2] => 32 [3] => 322 [4] => 3433 [5] => array ( [0] => 32 [1] => 232 [2] => 23232 ) )
1234
alsdfl;asdf
a

现在可以看到效果了,注意,最后一个不是我没有粘贴过来,而是他本来就没有显示什么东西。