This article is a detailed analysis and introduction to the differences between the three functions of var_dump, var_export and print_r in PHP. Friends in need can refer to it
The following example looks at the specific differences between these three functions. Var_dump and var_export are less commonly used, but they are very similar. So you can take a look:
The code is as follows:
<?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>";
Output:
The code is as follows:
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
Now you can see the effect. Note that the last one is not that I didn’t paste it over, but that it didn’t display anything in the first place.
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