PHP Study Notes 1-constant, function

PHP learning Notes 1-constant, function constant: use const (php5) declaration, can only be assigned once, php5 and earlier versions use define; 1 & lt ;? Php2constTHE_VALUE100; const3echoTHE_VALUE; 45 define (THE_VALUE, 200) in PHP5; earlier versions than PHP5 can use define6ec PHP learning Notes 1-constant, function

Constant: the const (php5) statement can only be assigned once. define is used for versions earlier than php5;

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Function: contains a lot of functional code blocks;
Advantage: easy to call elsewhere
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  '; 6 echo 'Hello World! '; 7 echo'
'; 8} 9 traceHelloPHP (); 10 11 // Another function execution method 12 $ func = 'tracehellophp'; // use the function as a parameter for passing, e.g. callback method 13 $ func (); 14 15 // input parameter of the function -- single input parameter 16 function sayHelloTo ($ name) {17 echo 'hello '. $ name.'
'; 18} 19 sayHelloTo ('Vito'); 20 21 // input parameters of the function -- multiple input parameters 22 function traceNum ($ a, $ B) {23 // echo 'a = '. $. ', B = '. $ B.'
'; 24 echo "a = $ a, B = $ B"; // a simpler method 25} 26 traceNum (2, 3); 27 28 function add ($, $ B) {29 return $ a + $ B; // return value 30} 31 echo add (10, 2 );
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