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PHP ??? ???(?? ?? ???)

PHP 7? ?? ??? ??? ???(?? ?? ???)? $a ? $b ? ???? ???? ? ?????. $a? $b?? ??? ??? ?? ?????. ?? -1, 0 ?? 1???.

Example

<?php
// 整型比較
print( 1 <=> 1);echo "<br/>";
print( 1 <=> 2);echo "<br/>";
print( 2 <=> 1);echo "<br/>";
echo "<br/>"; // PHP_EOL 為換行符

// 浮點(diǎn)型比較
print( 1.5 <=> 1.5);echo "<br/>";
print( 1.5 <=> 2.5);echo "<br/>";
print( 2.5 <=> 1.5);echo "<br/>";
echo "<br/>";

// 字符串比較
print( "a" <=> "a");echo "<br/>";
print( "a" <=> "b");echo "<br/>";
print( "b" <=> "a");echo "<br/>";
?>

? ???? ??? ?? ??? ??? ????.

???? ??

??? ??

<?php // 整型比較 print( 1 <=> 1);echo " "; print( 1 <=> 2);echo " "; print( 2 <=> 1);echo " "; echo " "; // PHP_EOL 為換行符 // 浮點(diǎn)型比較 print( 1.5 <=> 1.5);echo " "; print( 1.5 <=> 2.5);echo " "; print( 2.5 <=> 1.5);echo " "; echo " "; // 字符串比較 print( "a" <=> "a");echo " "; print( "a" <=> "b");echo " "; print( "b" <=> "a");echo " "; ?>

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