What errors are displayed by display_startup_errors=on in php.ini?

As the title states, there are two error display options in php.ini, display_errors and display_startup_errors. What kind of errors do they display respectively? It is best to give an example. Please give me some advice. Thank you.

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As the title states, there are two error display options in php.ini, display_errors and display_startup_errors. What kind of errors do they display respectively? It is best to give an example. Please give me some advice. Thank you.

Please refer to the manual
http://php.net/manual/zh/errorfunc.configuration.php

Look at the php configuration file, you will see a lot of incorrect configurations,

display_errors

Whether to disable PHP errors, when Off this configuration, all error messages will not be displayed
The default value is off, Production Value: Off, Development Value: On

Change the configuration value to support runtime configuration, which can be enabled in the script via ini_set('display_errors', 1)

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error_reporting

Set the level of error reporting. Common error levels are

valueInstructionsE_ALLShow all error reportsE_ERRORShows fatal errors that cause the script to endE_WARNINGGeneral warnings, such as methods being outdated, etc. E_NOTICECommon variables are undefined or array indexes are undefined

<code>//显示除去E_NOTICE、E_STRICT、E_DEPRECATED外的所有错误

默认值 Default Value: E_ALL & ~E_NOTICE & ~E_STRICT & ~E_DEPRECATED
Development Value: E_ALL
Production Value: E_ALL & ~E_DEPRECATED & ~E_STRICT
</code>

Runtime changes:

<code class="php">    error_reporting(0);//禁用错误报告
    error_reporting(E_ALL);//显示所有错误报告
    error_reporting(E_ALL & ~E_DEPRECATED );//显示除去E_DEPRECATED 外的其他所有错误</code>

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Log_errors

Set whether to record the error information of script running to the server error log or error_log. Note that this is a specific configuration item related to the server

Default Value: Off

Development Value: On
Production Value: On

track_errors

If enabled, the last error will always exist in the variable $php_errormsg.

Default Value: Off

Development Value: On
Production Value: Off

html_errors

The error message will be displayed on the page in HTML format

Default Value: On

Development Value: On
Production value: On