Some errors occurred after php was upgraded to 53+, such as ereg; ereg_replace; function error

When running in the php5.3 environment, error messages such as

Deprecated: Function ereg() is deprecated in... and Deprecated: Function ereg_replace() is deprecated in... often appear.
The reason is: PHP5.3 or above does not support the ereg() function, but uses the preg_match() function; it does not support the ereg_replace() function, but uses the preg_replace() function.
　Solution: Change the unsupported function to a supported function.
　
For example
if(eregi('^('value', $value)
Change to:
if (preg_match('/value/', $value)

Another example:
$string = ereg_replace(' value' , ' ', trim($string));
　 Change to:
　 $string = preg_replace('{ value}', ' ', trim($string));
　
Solve Deprecated: Assigning the return value of new by reference is deprecated in error

Because our current php is 5.3, you can use "=" directly in php5.3, but before, because of the local testing, the php environment below 5.3 used the "=&" symbol .

After version 5.3, the "=&" symbol is no longer allowed in the program. If your website has a Deprecated: Assigning the return value of new by reference is deprecated in error, don't worry, locate the wrong file first. , check whether "=&" is used in the program, and find that the "=&" symbol is used. After removing the '&' symbol, the program runs normally.

Problem: Deprecated: Function set_magic_quotes_runtime() is deprecated in
causing this. The reason for the prompt is that this feature (set_magic_quotes_runtime()) has been turned off after PHP5.3.
And this feature has been completely removed in PHP6.
You can comment or delete the wrong line, or add it in front of set_magic_quotes_runtime(). @symbol

The above has introduced some errors that occurred after PHP was upgraded to 53+, such as the error reported by the ereg; ereg_replace; function, including the relevant content. I hope it will be helpful to friends who are interested in PHP tutorials.