Differences between php var_export and var_dump

Source: Internet
Author: User
Tags php code php tutorial

Differences between var_export and var_dump in the php Tutorial
Problem discovery

When tracking yratings_get_targets,

Error_log (var_export (yblog_mspconfiginit ("ratings"), true ));
The returned value of yblog_mspconfiginit ("ratings") is NULL.

As a result, I thought it was impossible to establish a connection with the database, and it took a wrong day.

This is one of the differences between var_export and var_dump.

This is:

Cause

Var_export must return valid php code, that is, the code returned by var_export can be directly assigned a variable as a php code. And this variable will get the same type value as var_export.

However, when the variable type is resource, it cannot be simply copied. Therefore, when the var_export variable is resource type, var_export returns NULL.
Instance

$ Res = yblog_mspconfiginit ("ratings ");
Var_dump ($ res );
Var_export ($ res );
Result:

Resource (1) of type (yahoo_yblog)
NULL
For example:

$ Res = fopen('status.html ', 'r ');
Var_dump ($ res );
Var_export ($ res );
Result:

Resource (2) of type (stream)
NULL

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