PHP Strings

String Creation

$single = 'Single quoted';
$double = "Double quoted - $variable interpolated";

Common Functions

strlen($str);          // String length
strpos($str, "find");  // Find position
substr($str, 0, 5);    // Extract substring
str_replace("old", "new", $str);  // Replace text
strtolower($str);      // Convert to lowercase
strtoupper($str);      // Convert to uppercase
trim($str);            // Remove whitespace

Concatenation

Use . (dot operator):

$greeting = "Hello, " . $name . "!";

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