Summary of var_export function and comparison with var_dump

Recently, the original handwritten configuration file of the project has been moved to the management backend for easy configuration by others. This process uses the var_export function.

Summary:

1. According to official instructions, var_export must return legal PHP code. In other words, the code returned by var_export can be directly assigned to a variable as PHP code. This variable will obtain the same type of value as the one being var_exported, so the resource type cannot be simply copied. Therefore, when the variable of var_export is of resource type, var_export will return NULL. But var_dump will return the resource type.

//实验  
  $e = fopen("aa.php", "r");
  var_export($e);
  var_dump($e);

//运行结果
NULL
resource(3) of type (stream)

2. According to the official description, setting the second parameter to TRUE will return the representation of the variable.

$c = 'guugle';
  var_export($c); //直接打印出 'guugle'

  var_export($c, TRUE); //则无输出，返回变量表示
  $d = var_export($c, TRUE);
  echo $d; //输出 'guugle'

3. Var_export() generates configuration files for multiple users (var_export() will always retain structured data to store data)

$arr = array ( 1 , 2 , array ( "apple" , "banana" , "orange" )); 
  file_put_contents("aa.php", "<?php \n return ".var_export($arr, true)."\n?>"); //注意：需要加第二个参数TRUE返回变量的表示

results:

The above introduces the summary of the var_export function and its comparison with var_dump, including the relevant aspects. I hope it will be helpful to friends who are interested in PHP tutorials.