text: PHP has a operator that allows the user to join two variables together. And that operator is a dot (.)\n\nSo if you have this: \n==============================\n<?php\n$disp = 'Hi ';\n$disp .= 'm0';\nprint $disp;\n?>\n==============\n\nThe above will print:\nHi m0\n\nWhen we say equal it is intializing that variable to that. like\n====\n$a = 1;\n$b = 2;\n====\nSo if I print out a it will be 1 or if I prinf out b it will be 2.\n\nIf I say:\n====\n$a = 1;\n$c = $a.'3';\nprint $c;\n====\nThat will print out  13\n\nYou could have other forms of operators such as:\n===\n$a =1;\n$a += 2;\n=== \na will print out 3 since (a += b) is the same as   a = a + b;\n\nThe correct word for it would be concatentation between variables, the other operators like - or + are only valid for numbers integers.\n\nGood luck on your quest.