[SOLVED] Add substring at beginning of string if doesn't exist

Add substring at beginning of string if doesn't exist

I want to add a substring (text) at beginning of string only if this string doesn't have already this text at beginning.

Example:

// let's say I want to add "Has" at beginning (if doesn't exist)

$string_1 = "AnaHasSomeApples"; // we need to add
$string_2 = "HsSomeApples"; // we need to add
$string_3 = "HasApplesAlready"; // already exists at the beginning

I tried this:

$string = (strpos($string, 'Has') === false ? 'Has' : '') . $string;

I know is not hard to do that.

I am more interested in finding the fastest (according to time, not lines of code) possible way.

Solution

I am checking if Has is not at position 0 then prepend 'Has' with existing string
You can use ternary operator to achieve this,

$string_1 = "AnaHasSomeApples"; // we need to add
$string_2 = "HsSomeApples"; // we need to add
$string_3 = "HasApplesAlready"; // already exists at the beginning

echo "string_1: ". (strpos($string_1,"Has") !== 0 ? "Has".$string_1: $string_1)."\n";
echo "string_2: ". (strpos($string_2,"Has") !== 0 ? "Has".$string_2: $string_2)."\n";
echo "string_3: ". (strpos($string_3,"Has") !== 0 ? "Has".$string_3: $string_3)."\n";

Output

string_1: HasAnaHasSomeApples
string_2: HasHsSomeApples
string_3: HasApplesAlready

Demo.