![SOLVED: Q1: Explain the following PHP string functions with examples: substr(), strlen(), strreplace(), trim(), strpos(), strtolower(), strtoupper(), isstring(). SOLVED: Q1: Explain the following PHP string functions with examples: substr(), strlen(), strreplace(), trim(), strpos(), strtolower(), strtoupper(), isstring().](https://cdn.numerade.com/ask_images/c1b7b97382ca4edebf84369ab39dc6fa.jpg)
SOLVED: Q1: Explain the following PHP string functions with examples: substr(), strlen(), strreplace(), trim(), strpos(), strtolower(), strtoupper(), isstring().
![php tutorial - PHP substr Function - php programming - learn php - php code - php script - wikitechy php tutorial - PHP substr Function - php programming - learn php - php code - php script - wikitechy](https://www.wikitechy.com/php/img/php-images/code-explanation-php-substr-function.png)
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![PHP Exercises: Count a substring of length 2 appears in a given string and also as the last 2 characters of the string - w3resource PHP Exercises: Count a substring of length 2 appears in a given string and also as the last 2 characters of the string - w3resource](https://www.w3resource.com/w3r_images/php-basic-algorithm-exercise-31.png)