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

2018-12-30 PHP 前端之家

前端之家收集整理的这篇文章主要介绍了解析php中var_dump,var_export,print_r三个函数的区别，前端之家小编觉得挺不错的，现在分享给大家，也给大家做个参考。

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：
<div class="codetitle"><a style="CURSOR: pointer" data="42147" class="copybut" id="copybut42147" onclick="doCopy('code42147')"> 代码如下:

<div class="codebody" id="code42147">
<?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 "
";
var_dump($b);
echo "
";
var_dump($c);
echo "
";
var_dump($d);
echo "
";
var_dump($e);
echo "
";
echo "
";
echo "
";
echo "
";
var_export($a);
echo "
";
var_export($b);
echo "
";
var_export($c);
echo "
";
var_export($d);
echo "
";
var_export($e);
echo "
";
echo "
";
echo "
";
echo "
";
print_r($a);
echo "
";
print_r($b);
echo "
";
print_r($c);
echo "
";
print_r($d);
echo "
";
print_r($e);
echo "
";

输出：

<div class="codetitle"><a style="CURSOR: pointer" data="33861" class="copybut" id="copybut33861" onclick="doCopy('code33861')"> 代码如下:

<div class="codebody" id="code33861">
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。

原文链接：https://www.f2er.com/php/26097.html

print_r var_dump var_export