<?php //normal function declaration function greeting(){ return "Hellow Developers!"; } echo greeting(); echo "\n"; //function argument and parameter function addition($a,$b){ return $a+$b; } echo addition(10,20); echo "\n"; //default function argument function defaultParam($a,$b=30){ return $a+$b; } echo defaultParam(10); echo "\n"; echo defaultParam(10,25); echo "\n"; //variable scope within function $global = "I am a global variable"; function variableScope(){ echo $local = "I am a local variable"; echo "\n"; global $global ; echo $global; echo "\n"; echo $GLOBALS['global']; echo "\n"; } variableScope(); //anonymous function $anonymousFunction = function($a){ return $a*$a; }; echo $anonymousFunction(10); echo "\n"; //arrow function $arraowFunc = fn($a,$b)=>($a+$b); echo $arraowFunc(20,30); echo "\n"; //callback function function myFunc($callback){ return $callback("World"); } $result = myFunc(function($xyz){ return "Hellow, $xyz"; }); echo $result; ?>
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