php var_dump() 与 print_r() [英] php var_dump() vs print_r()

问题描述

var_dump() 和 print_r() 在将数组作为字符串吐出方面有什么区别?

What is the difference between var_dump() and print_r() in terms of spitting out an array as string?

推荐答案

var_dump 函数显示有关变量/表达式的结构化信息，包括其类型和值.数组以缩进的值进行递归探索以显示结构.它还显示哪些数组值和对象属性是引用.

The var_dump function displays structured information about variables/expressions including its type and value. Arrays are explored recursively with values indented to show structure. It also shows which array values and object properties are references.

print_r() 以人类可读的方式显示有关变量的信息.数组值将以显示键和元素的格式呈现.类似的符号用于对象.

The print_r() displays information about a variable in a way that's readable by humans. array values will be presented in a format that shows keys and elements. Similar notation is used for objects.

示例:

$obj = (object) array('qualitypoint', 'technologies', 'India');

var_dump($obj) 将在屏幕下方显示输出.

var_dump($obj) will display below output in the screen.

object(stdClass)#1 (3) {
 [0]=> string(12) "qualitypoint"
 [1]=> string(12) "technologies"
 [2]=> string(5) "India"
}

并且，print_r($obj) 将在屏幕下方显示输出.

And, print_r($obj) will display below output in the screen.

stdClass Object ( 
 [0] => qualitypoint
 [1] => technologies
 [2] => India
)

更多信息

• var_dump
• print_r

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