How to solve the problem that the php verification code cannot be loaded

Solution to the problem that the php verification code cannot be loaded: 1. Check whether the path of the verification code class and verification code font introduces errors; 2. Place the header before any actual output; 3. Check the encoding of all files Is the format uniform? 4. Enable the php gd2 extension; 5. Delete all line breaks in the file, etc.

The operating environment of this article: windows7 system, PHP7.1 version, DELL G3 computer

php verification code cannot be loaded. Click on the reason

It is a headache that the verification code cannot be loaded. There are some reasons below, you can take a look accordingly.

PHP verification code loading failed one:

The path of the verification code class introduced an error

The path of the verification code font introduced an error

PHP verification code loading Unsuccessful 2:

Add the flush cache function ob_clean(); in front of the heaer(); function of the output image (usually many people make this mistake)

Please pay attention to header() Must be called before any actual output, whether it is ordinary HTML tags, blank lines, or spaces in file or PHP output. This is a common mistake. When accessing functions in other files through include, require, or other functions, if there are spaces or blank lines before header() is called. The same problem exists with separate PHP/HTML files.

PHP verification code loading failed three:

Check whether the encoding format of all files is unified

For example: the encoding of some PHP files is utf-8, while others are utf-8, to remove it, you need to use some visual editors such as node, editplus and other software to modify the encoding format to utf-8

PHP verification code loading failed four:

The sensitivity of the windows development environment and the Linux environment to the case of letters

Must be uniform in upper and lower case and maintain the consistency of the upper and lower case of letters

Unsuccessful loading of PHP verification code five:

The corresponding php gd2 extension is not enabled

PHP verification code loading failed six:

This situation is quite special and may be caused by spaces in the file. Delete all newlines and the like in the file

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