PHP项目绘图提示词如何后端拼接处理

wen PHP项目 2026-06-28 250

本文目录导读：

PHP项目绘图提示词如何后端拼接处理

基础拼接模式
结构化模板拼接（推荐）
多部件智能拼接
规则验证与安全处理
API调用完整示例
最佳实践总结

对于PHP后端拼接处理绘图提示词,核心思路是将用户输入、动态参数、系统规则进行安全组合，然后传递给绘图API（如DALL-E、Midjourney API、Stable Diffusion API等）。

以下是完整的后端拼接处理方案：

基础拼接模式

<?php
// 简单字符串拼接
$userInput = '一只站在树上的猫头鹰';
$style = '水彩风格';
$resolution = '4k';
$prompt = $userInput . '，' . $style . '，' . $resolution;
// 结果：一只站在树上的猫头鹰，水彩风格，4k

结构化模板拼接（推荐）

<?php
class PromptBuilder {
    private $templates = [
        'portrait' => '{subject}，{style}肖像，{lighting}光线，{details}',
        'landscape' => '{subject}风景，{style}，{time}，{weather}',
        'fantasy' => '{subject}，{style}风格，{elements}，{mood}氛围'
    ];
    private $params = [];
    public function setTemplate($type) {
        $this->currentTemplate = $this->templates[$type] ?? '';
        return $this;
    }
    public function setSubject($subject) {
        $this->params['{subject}'] = $this->sanitize($subject);
        return $this;
    }
    public function setStyle($style) {
        $this->params['{style}'] = $this->sanitize($style);
        return $this;
    }
    public function setExtra($key, $value) {
        $this->params['{' . $key . '}'] = $this->sanitize($value);
        return $this;
    }
    private function sanitize($text) {
        // 去除可能破坏提示词的字符
        return preg_replace('/[<>{}()"]/', '', $text);
    }
    public function build() {
        $prompt = $this->currentTemplate;
        foreach ($this->params as $key => $value) {
            $prompt = str_replace($key, $value, $prompt);
        }
        return $prompt;
    }
}
// 使用示例
$builder = new PromptBuilder();
$prompt = $builder->setTemplate('portrait')
                  ->setSubject('中国水墨风格的美女')
                  ->setStyle('工笔细描')
                  ->setExtra('lighting', '柔和的自然光')
                  ->setExtra('details', '丝绸衣服，扇子')
                  ->build();

多部件智能拼接

<?php
function buildPrompt($userInput, $options = []) {
    $parts = [
        'main' => $userInput,
        'style' => $options['style'] ?? '',
        'medium' => $options['medium'] ?? '',
        'lighting' => $options['lighting'] ?? '',
        'color' => $options['color'] ?? '',
        'composition' => $options['composition'] ?? '',
        'mood' => $options['mood'] ?? '',
        'quality' => $options['quality'] ?? '4k, 高细节',
        'negative' => $options['negative'] ?? '' // 负向提示词
    ];
    // 过滤空值
    $parts = array_filter($parts);
    // 构建正向提示词
    $positive = implode('，', array_diff_key($parts, ['negative' => '']));
    // 处理负向提示词
    $negative = $parts['negative'] ?? '';
    return [
        'prompt' => $positive,
        'negative_prompt' => $negative,
        'raw' => $parts
    ];
}
// 使用
$result = buildPrompt('赛博朋克风格的猫', [
    'style' => '写实',
    'lighting' => '霓虹灯',
    'color' => '蓝色调',
    'negative' => '模糊，低质量，扭曲'
]);

规则验证与安全处理

<?php
function validateAndBuild($userInput) {
    // 1. 长度限制
    if (mb_strlen($userInput) > 500) {
        throw new Exception('输入过长');
    }
    // 2. 敏感词过滤
    $badWords = ['暴力', '色情', '恐怖'];
    foreach ($badWords as $word) {
        if (mb_strpos($userInput, $word) !== false) {
            throw new Exception('包含敏感内容');
        }
    }
    // 3. 特殊字符转义
    $cleanInput = htmlspecialchars($userInput, ENT_QUOTES, 'UTF-8');
    // 4. 添加系统级关键词
    $systemRules = [
        'safe_work' => true,
        'no_watermark' => true
    ];
    $prompt = $cleanInput;
    if ($systemRules['safe_work']) {
        $prompt .= '，安全内容，适宜所有年龄';
    }
    if ($systemRules['no_watermark']) {
        $prompt .= '，无水印';
    }
    return $prompt;
}

API调用完整示例

<?php
// 完整流程：接收 -> 拼接 -> 验证 -> 发送API
function generateImage($userInput, $options = []) {
    // 1. 构建提示词
    $builder = new PromptBuilder();
    $prompt = $builder->setTemplate('landscape')
                      ->setSubject($userInput)
                      ->setStyle($options['style'] ?? '写实')
                      ->setExtra('time', '黄昏')
                      ->setExtra('weather', '晴朗')
                      ->build();
    // 2. 验证
    $cleanPrompt = validateAndBuild($prompt);
    // 3. 构建API请求
    $apiData = [
        'prompt' => $cleanPrompt,
        'negative_prompt' => '模糊，低质量',
        'width' => 1024,
        'height' => 1024,
        'steps' => 20,
        'cfg_scale' => 7
    ];
    // 4. 发送到绘图API
    $response = sendToDrawingAPI($apiData);
    return $response;
}
function sendToDrawingAPI($data) {
    $ch = curl_init('https://api.example.com/v1/images/generations');
    curl_setopt_array($ch, [
        CURLOPT_POST => true,
        CURLOPT_HTTPHEADER => [
            'Content-Type: application/json',
            'Authorization: Bearer ' . API_KEY
        ],
        CURLOPT_POSTFIELDS => json_encode($data),
        CURLOPT_RETURNTRANSFER => true
    ]);
    $response = curl_exec($ch);
    curl_close($ch);
    return json_decode($response, true);
}