Validating a password in php
So if your rules was CVC-VCV, the user would have to enter consonant, vowel, consonant followed by a dash, followed by vowel, consonant, vowel. It lets you validate a field by a regular expression.
This rule comes in two forms: one with a Reg Exp flag (like “g” for global, “i” for case-insensitive etc.) and one without.
Re-entering form values One question I get asked a lot is concerning re-entering the form values when the user fails to enter something in correctly.
Simple and safe workaround for this is using strlen() before filter_val().
This will currently cause the alerted messages to be truncated.
To recap: the validation rules are all of the following form: This allows us to only validate a field only if a fieldname FIELDNAME has - or doesn’t have - a value VALUE. you can have multiple if clauses, separated by a comma.
Due to the way the Java Script validation works – rule by rule, showing a single popup error at a time – the function rule was needed to let you leave the standard control flow execution and run your own function(s).
With PHP, this isn’t required: you can simply embed the custom scripts directly in the PHP code.
We’ll go into more detail in the later pages – this page is mainly just to give you a general sense of how it fits together. Download and upload the PHP validation script (validation.php) to your web server and include() or require() that file via PHP in your form page. When the form successfully passes your validation rules, you can redirect via PHP to whatever page you want the user to see next.