Using str_replace in PHP: Basic and Advanced Examples
This tutorial explains PHP's str_replace function, demonstrating simple string replacement, array‑based replacements, and a less common usage where both search and replace parameters are arrays, with example outputs and screenshots illustrating each case.
In this article the author explains the PHP function str_replace, which performs case‑sensitive string replacement, and demonstrates several usage patterns found while reading the ThinkPHP framework source.
The first example shows a simple replacement where the word “world” in the string “Hello world!” is replaced by “Peter”, producing “Hello Peter!”.
The second example extends the function to replace multiple occurrences using arrays, showing how the function can replace each element of a search array with the corresponding element of a replace array and reporting the number of replacements performed.
The third example illustrates a less common usage where both the search and replace arguments are arrays, a technique discovered in the framework’s source code for generating SQL statements.
Each example is accompanied by screenshots of the controller output and the resulting transformed strings.
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