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# PHPHP
PHPHP is a self-hosted interpreter of tiny subset of PHP implemented in pure PHP.
## Requirements
- PHP 8.4
## Installation
No runtime dependencies!
## Usage
```bash
php index.php
```
It will output the following:
```
Running on PHP
Running on PHPHP on PHP
Running on PHPHP on PHPHP on PHP
Hello, World!
```
The script, [hello.php](./hello.php), is executed on PHPHP on PHP.
### PHPHP on PHPHP on PHP
Edit this line as the following:
```diff
if (defined('PHPHP')) {
- if (PHPHP < 2) {
+ if (PHPHP < 3) {
echo "Running" . str_repeat(" on PHPHP", PHPHP) . " on PHP\n";
```
Then, execute `index.php`. I recommend that you enable JIT.
```bash
php -d opcache.enable_cli=on -d opcache.jit=on -d opcache.jit_buffer_size=1G index.php
```
It will execute hello world on PHPHP on PHPHP on PHP.
```
Running on PHP
Running on PHPHP on PHP
Running on PHPHP on PHPHP on PHP
Running on PHPHP on PHPHP on PHPHP on PHP
Hello, World!
```
## Talks
[Talk in PHPerKaigi 2025 (in Japanese)](https://fortee.jp/phperkaigi-2025/proposal/ef8480fc-1403-4020-9f24-aca9361f51e4)
## License
See [LICENSE](./LICENSE).
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