PHP string filtering and conversion functions

Several useful php stringsFiltering and conversion functions, mainly the safe processing of some characters and string processing

nl2br();// \n to
addslashes(); stripslashes();//When operating on the database, escape special characters
chop();//Remove the right side of the string Spaces
trim();//Remove all spaces in the string
ltrim();//Remove the spaces on the left side of the string
htmlspecialchars();//Convert '$', '"','<','>' are corresponding html entities
htmlentities();//Convert all html tags into corresponding html entities
array explode(string separator , string str);//Split string
string implode(string separator, array arr);//Connect string
strtoupper(); strtolower();//Convert case
ucfirst() ;//Convert only the first character to uppercase
ucwords();//Convert the first letter of each word to uppercase

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