Detailed explanation of comparison operators in php_PHP tutorial

1. For arrays
$a=array(1,2,3,6);
$b=array(1,2,3,6,8);
echo "n";
var_dump( $a>$b);
var_dump( $a==$b);
var_dump( $a<$b);

Result:
boolean false
boolean false
boolean true

ps: array with fewer members is smaller

$a=array(1,2 ,3,6,9);
$b=array(1,2,3,6,8);
echo "n";
var_dump( $a>$b);
var_dump( $a==$b);
var_dump( $a<$b);
boolean true
boolean false
boolean false

ps: Compare values ​​one by one

$a=array(1,2,3,6,'b'=>3);
$b=array( 1,2,3,6,8);
echo "n";
var_dump( $a>$b);
var_dump( $a==$b);
var_dump( $ a<$b);
boolean false
boolean false
boolean false

ps: If the key in operand 1 does not exist in operand 2, the arrays cannot be compared and false will be returned.

2. Compare bool or null with other types

var_dump((bool)(null));//boolean false//convert null to false when bool;

null and other types are converted to bool and then compared, and FALSE < TRUE

http://www.bkjia.com/PHPjc/824984.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/824984.htmlTechArticle1. For array $a=array(1,2,3,6); $b=array(1 ,2,3,6,8); echo "n"; var_dump( $a$b); var_dump( $a==$b); var_dump( $a$b); Result: boolean false boolean false boolean true ps : Has...