Some of the built-in function notes for PHP

File (), gets the files returned by an array, with a space, stripped space with trim ()

The trim () function removes white space characters or other predefined characters on either side of the string.

File_put_contents (need to write the new name of the file, the contents of the file need to be written);

File_get_contents () reads the entire file into a string.

Preg_replace (the content to be replaced, the replacement of the content, the replacement string, the number of replacements) regular substitution

If limit is omitted or the value is-1, all occurrences will be replaced

Strstr (file, string to find in file)

Str_replace (the content to replace, the replacement of the content, the replacement string) is only replaced once case-sensitive

Str_ireplace () is case insensitive

$_server[http_host] Gets the current host name

$_server[http_name] Get the current hostname "difference"

File_exits () to determine if a file exists

Some of the built-in function notes for PHP