What is the functionality of the function strstr and stristr?

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With strstr you can find a certain letter, number, or symbol in a string. A basic function could be to figure out if an email address is valid or not.

The stristr function is just a Case-Insensitive version of strstr.

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What is PHP?
And where are you use?
and why are you use?
so please explain and give me advise about php because i want to learn php...

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With strstr you can find a certain letter, number, or symbol in a string. A basic function could be to figure out if an email address is valid or not.

<?php
$email = "email@email.com";
$domain = strstr($email,"@");
$dot = strstr($domain,".");

if ($domain == "" && $dot == "")
{
do something
}
else
{
do something else
}
?>

The strstr in $domain is looking for "@" in $email and the strstr in $dot is looking for a "." in $domain. The if means if $domain and $dot equal nothing(it would show up as blank because there is no "@" in $email so the strstr in $domain returns false and that would in turn return the strstr in $dot as false also), do something. then the else is if $domain and $dot equal something besides "" do something else.

The stristr function is just a Case-Insensitive version of strstr.

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Both the functions are used to find the first occurrence of a string. Parameters includes: input String, string whose occurrence needs to be found, TRUE or FALSE (If TRUE, the functions return the string before the first occurrence.

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