php-ebpf/example/tracing/uprobe.php

<?php
$bpf_text = <<<EOT
#include <uapi/linux/ptrace.h>

int test(struct pt_regs *ctx)
{
        bpf_trace_printk("%d---%d\\n",ctx->di,ctx->si);
        return 1;
}
EOT;

$ebpf = new Bpf(["text" => $bpf_text]);
// $arr = array("pid"=>-1);
$ebpf->attach_uprobe("/opt/github/phpcpp_helloworld/a.out","add","test",[]);
// $ebpf->trace_print();
# header
printf("%-18s %-16s %-6s %s\n", "TIME(s)", "COMM", "PID", "MESSAGE");
# format output
while (true) {
    try {
        list($task, $pid, $cpu, $flags, $ts, $msg) = $ebpf->trace_fields();
        printf("%-18.9f %-16s %-6d %s\n", $ts, $task, $pid, $msg);
        flush();
    } catch (Exception $e) {
        continue;
    }
}