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The insert method is used to create string templates and to allow for key/value replacements.

String::insert('My name is :name and I am :age years old.', array('name' => 'Bob', 'age' => '65'));
// generates: "My name is Bob and I am 65 years old."

1. String::insert('My name is :name and I am :age years old.', array('name' => 'Bob', 'age' => '65'));
2. // generates: "My name is Bob and I am 65 years old."