PHP 面试题与答案
Question: I want to combine two variables together:Answer:$var1 = 'Welcome to '; $var2 = 'TechInterviews.com';What will work faster? Code sample 1: - $var 3 = $var1.$var2;Or code sample 2: $var3 = "$var1$var2";Both examples would provide the same result - $var3 equal to "Welcome to TechInterviews.com". However, Code Sample 1 will work significantly faster. Try it out with large sets of data (or via concatenating small sets a million times or so), and you will see that concatenation works significantly faster than variable substitution. |
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