It is quite easy to do form validations using that script.
The process is quite simple which we will see it in the following steps.
According to the Capability Maturity Model (CMM) we can also define validation as The process of evaluating software during or at the end of the development process to determine whether it satisfies specified requirements. A product can pass while verification, as it is done on the paper and no running or functional application is required.
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Simple and safe workaround for this is using strlen() before filter_val().
I'm not sure about 5.3.4 final, but it is written that some 5.3.4-snapshot versions also were affected.
This allows your visitors to correct errors instantly, and only valid email addresses will be accepted.
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