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php »ù´¡±Ê¼Ç operators

/***************************by
garcon1986********************************/
<?php
//php avancé 5 example
$a = 'hello';
$a .= 'world';
$table = 'users';
$id = 5;
$sql = 'SELECT * from'.$table. "WHERE ID = '$id'";
//date() GÏÔʾ24СʱµÄ¸ñʽ£¬iÏÔʾ·ÖÖÓ
echo 'il est'.date('G \h i').'il fait beau<p>';
// '=', '==', '===' ÈýÕßÇø±ð: '='ÊǸ³Öµ£¬ÓұߵÄÖµ¸³¸ø×ó±ß£»'=='ÊÇÖµÏàµÈ£¬ÀàÐͲ»Ò»¶¨µÈ£»'==='ÊǺãµÈ£¬ÖµÏàµÈÀàÐÍÒ²ÏàµÈ£»'!=='ÊÇÖµ²»µÈ£¬»òÀàÐͲ»µÈ¡£
$a = '34';
$b = 34;
$a == $b;
//echo (boolean)($a == $b);
var_dump((bool) $a == $b);
echo '<br>';
$a === $b;
//echo (boolean)($a === $b);
var_dump((bool) $a === $b);
echo '<br>';
var_dump((bool)($a !== $b));
echo '<p>';
//arithmetic operator
echo 5*"", '<br>'; //0
echo 5+false, '<br>'; //5
echo 5/NULL, '<br>'; //Warning: Division by zero
//assignment operator
$a = ($b = 4) + 5; // $a ÏÖÔÚ³ÉÁË 9£¬¶ø $b ³ÉÁË 4¡£
echo "$a,$b<br>";
$a = 3;
$a += 5; // sets $a to 8, as if we had said: $a = $a + 5;
$b = "Hello ";
$b .= "There!"; // sets $b to "Hello There!", just like $b = $b . "There!";
echo "$a,$b<br>";
//bitwise operator
echo 12 ^ 9; // Êä³öΪ '5'
echo '<br>';
echo "12" ^ "9"; // Êä³öÍ˸ñ×Ö·û£¨ascii 8£©
// ('1' (ascii 49)) ^ ('9' (ascii 57)) = #8
echo '<br>';
echo "hallo" ^ "hello"; // Êä³ö ascii Öµ #0 #4 #0 #0 #0
echo '<p>'; // 'a' ^ 'e' = #4
/*
--------- --------- -- ---------
result value op test
--------- --------- -- ---------
Bitwise AND
( 0 = 0000) = ( 0 = 0000) & ( 5 = 0101)
( 1 = 0001) = ( 1 = 0001) & ( 5 = 0101)
( 0 = 0000) = ( 2 = 0010) & ( 5 = 0101)
( 4 = 0100) = ( 4 = 0100) & ( 5 = 0101)
( 0 = 0000) = ( 8 = 1000) & ( 5 = 0101)
Bitwise Inclusive OR
( 5 = 0101) = ( 0 = 0000) | ( 5 = 0101)
( 5 = 0101)


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php »ù´¡±Ê¼Ç logic statements

/***************************by
garcon1986********************************/
<?php
//if Óï¾ä
$a = $b = 3;
if($a = $b)
print "a is equal to b<br>";
//else Óï¾ä
if($a < $b){
print "a is smaller than b";
} else {
print "a is not smaller than b<br> ......
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