How does a PHP function return a string?

PHP functions can return strings through the return statement: Return a string literal: Use quotes to specify the string. Returns a variable reference: a reference to the string stored in the variable. Concatenate strings: Use the dot operator to concatenate strings. String interpolation: Use curly braces to perform string interpolation.

How PHP functions return strings

In PHP, functions can use the return statement to return a value to the calling code. For strings, you can use string literals or reference string variables.

Return of String value

To return a string literal, you can use quotation marks to specify the string directly:

function getGreeting() {
  return "Hello, world!";
}

echo getGreeting(); // 输出 "Hello, world!"

Reference of variable

You can also use A variable reference returns the string stored in the variable:

$greeting = "Greetings from PHP!";

function returnGreeting() {
  return $greeting;
}

echo returnGreeting(); // 输出 "Greetings from PHP!"

String Concatenation and Interpolation

Multiple strings can be concatenated using the dot operator (.), String interpolation can also be performed using curly braces ({}):

function buildMessage($name, $age) {
  return "Hello, $name! You are $age years old.";
}

echo buildMessage("John", 30); // 输出 "Hello, John! You are 30 years old."

Practical Example

Consider a function that returns a string of abbreviations for a given word:

function getAcronym($words) {
  $acronym = "";
  foreach (explode(" ", $words) as $word) {
    $acronym .= strtoupper($word[0]);
  }
  return $acronym;
}

echo getAcronym("United States of America"); // 输出 "USA"

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