What are the best practices for efficiently checking if a string contains certain characters in PHP?

When checking if a string contains certain characters in PHP, the best practice is to use the `strpos()` function to efficiently search for the characters within the string. This function returns the position of the first occurrence of a substring within a string, or `false` if the substring is not found. By utilizing `strpos()` along with conditional statements, you can easily determine if the string contains the desired characters. 

$string = "Hello World";
$characters = "lo";

if(strpos($string, $characters) !== false){
    echo "String contains the characters 'lo'";
} else {
    echo "String does not contain the characters 'lo'";
}

Keywords

string characters checking PHP functions efficiency

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