Wednesday 29 March 2017

php - What is the difference between strcmp() and Spaceship Operator ()



In PHP 7 we have a new operator, spaceship operator <=>, and I found it very similar (if not the same) to strcmp().



Is there any difference between them?




Edit: Im asking the difference between them both, not refered What is <=> (the 'Spaceship' Operator) in PHP 7? or What is <=> (the 'Spaceship' Operator) in PHP 7?


Answer



strcmp - it is function for "binary safe" string comparison



The spaceship operator (<=>) returns -1 if the left side is smaller, 0 if the values are equal and 1 if the left side is larger. It can be used on all generic PHP values with the same semantics as < , <=, ==, >=, >. This operator is similar in behavior to strcmp() or version_compare(). This operator can be used with integers, floats, strings, arrays, objects, etc.



For example you can compare arrays or objects, and by float you get different result:



$var1 = 1.3;
$var2 = 3.2;

var_dump($var1 <=> $var2); // int(-1)
var_dump(strcmp($var1, $var2)); // int(-2)


And other differences...



More example this


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