PHP:Testing strings and numbers

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A simple if statement tests a condition, the following statement will be run only if the condition is true.

Testing for string equality

Notice that we use operator == here.

Print the name of the country if the region is "North America"

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Testing for number equality

When testing numbers you should use the == operator.

Print the name of the countries with a population of exactly 2000000

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Testing for pieces of a string at either end

You can check to see if one string starts with a particular value or ends with a value using substr_compare() function.

Print only those countries where the name ends with land

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Testing for pieces of a string in the middle

You can check to see if one string contains another using the strstr() function.

Print only those countries where the name includes ee.

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Testing for inequality

Print only those countries where pop is less than 20000

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