How to highlight fragments in long strings that are the same as substring array elements in substrings in PHP?

This article describes how to highlight the parts of a long string that matches the substring array elements in PHP.

Suppose we have a long string $aa and an array $str with multiple substrings, we need to find the same fragment as the $str element in $aa and highlight it.

The improved method utilizes PHP's built-in functions to improve efficiency and code readability. First, use the mb_str_split function to split the string to be matched into a substring array of specified length, avoiding the cumbersome operations of manual loops and mb_substr . Then, use the array_reduce function to iterate over each substring, resulting in an array of key-value pairs where the key is a substring and the value is a highlighted string with HTML tags (e.g., red style). Finally, use strtr function to efficiently replace the matching substring in $aa to complete the highlighting.

This method is more efficient than simple loop comparisons, and the code is simpler and easier to understand. The final output contains the highlighted matching clip. This method makes full use of the advantages of PHP string processing functions and effectively improves code efficiency and maintainability.

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