How to sanitze user input in PHP before mailing?

How to sanitze user input in PHP before mailing?

php security email sanitize

php

When to filter/sanitize data: before database insertion or before display?

php html filter sanitize

php

Is mysql_real_escape_string() necessary when using prepared statements?

php mysql mysqli prepared-statement sanitize

php

WordPress - How to sanitize multi-line text from a textarea without losing line breaks?

php wordpress textarea line-breaks sanitize

php

Best way to sanitize exec command with user inserted variables

php exec sanitize

php

Using Wordpress, can some one tell me the best way of sanitizing input?

php wordpress sanitize

php

PHP Sanitize Data

php sanitize

php

which one should performe first ? sanitizing or validation

php validation sanitize

php