stristr(): finding first occurrence of a sting

$text = 'Learn PHP Strings';
echo stristr($text, 'php'); // PHP Strings

$haystack="myuserid@example.com";
$needle="@";
echo stristr($haystack,$needle,false);// @example.com

@example.com

echo stristr($haystack,$needle,$before);

Example 1 of strstr()

$haystack="myuserid@example.com";
$needle="@";
echo stristr($haystack,$needle,true);// myuserid

myuserid

Example 2 of strstr()

$haystack="Welcome to plus2net.com to learn PHP";
$needle="TO";
echo stristr($haystack,$needle);// to plus2net.com to learn PHP

to plus2net.com to learn PHP

When to use stristr()

stristr() finds the first case-insensitive occurrence and returns the matching suffix. This works for searching human-readable text when differences in case should not matter:

$message = 'Learning PHP Strings';
$match = stristr($message, 'php');
if ($match !== false) {
    echo $match; // PHP Strings
}

Use strstr() for case-sensitive matching. A substring search is not a security filter: searching for https:// or <a cannot reliably identify or remove unsafe input. Validate and sanitize by the data type, and escape user-provided text on HTML output.

Searching Blank space inside a string

$string='first second';
if (stristr($string,' ')) {
echo " There is blank space present inside the string ";
}else{
echo " There is NO blank space present inside the string ";
}

 There is blank space present inside the string

Subhendu Mohapatra

Author & Instructor at plus2net

I write and maintain practical tutorials on Python, PHP, SQL, JavaScript, HTML, jQuery, and web development at plus2net. The tutorials focus on clear explanations, working examples, and code that readers can test and adapt while learning.

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