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PHP program to convert string to lowercase without using the library function

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mahmoud2506
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2022-05-26
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Given a string and we have to convert it into lowercase string without using any library function.

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mahmoud2506
2022-05-26
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PHP code to check substring in the string

<?php

//function  to find the substring Position
//if substring exists in the string
function findMyWord($s, $w) {
    if (strpos($s, $w) !== false) {
        echo 'String contains ' . $w . '<br/>';
    } else {
        echo 'String does not contain ' . $w . '<br/>';
    }
}

//Run the function
findMyWord('The Quick brown fox jumps right over the Lazy Dog', 'fox');
findMyWord('The Quick brown fox jumps right over the Lazy Dog', 'hello');
?>

Output

String contains fox
String does not contain hello

Explanation:

To check if a string contains a word (or substring) we use the PHP strpos() function. We check if the word ($w) is present in the String ($s). Since strpos() also returns non-Boolean value which evaluates to false, We have to check the condition to be explicit !== false (Not equal to False) Which ensures that we get a more reliable response.

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