Php how to determine whether the file exists or not, create a new

This article mainly shows you the "php how to determine whether the existence of the file is new", the content is easy to understand, clear, hope to help you solve your doubts, the following let the editor lead you to study and learn about "how to achieve php to determine whether the file exists then the new" this article.

Php implements a new method to determine whether a file exists: [function mkdirs ($dir, $mode = 0777) {if (is_dir ($dir) | | @ mkdir ($dir, $mode)) return TRUE;if...].

This article operating environment: windows10 system, php 7, thinkpad T480 computer.

We usually make a judgment before creating a file, not if the file we want to create exists, and only if the file we want to create does not exist. So how do you implement it with php code? The following is the specific implementation code, let's take a look at it.

The code is as follows:

Function mkdirs ($dir, $mode = 0777) {if (is_dir ($dir) | | @ mkdir ($dir, $mode)) return TRUE; if (! mkdirs (dirname ($dir), $mode) return FALSE; return @ mkdir ($dir, $mode);} mkdirs ("aa01")

The default mode is 0777, which means the maximum possible access. For more information about mode, read the chmod () page.

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