回答編集履歴
1
追記
answer
CHANGED
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@@ -21,4 +21,19 @@
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21
21
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$content=preg_replace_callback($pattern,$callback,$content);
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print nl2br(htmlspecialchars($content));
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23
23
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?>
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24
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+
```
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+
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26
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#追記
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27
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古い書き方だと、関数名を文字列として渡せばOK
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28
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+
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29
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```PHP
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30
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function callback_func($a){
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31
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$opt="@2x";
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32
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$add="";
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if(file_exists($a[3].$opt.$a[4])){
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34
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$add="srcset=\"{$a[3]}{$a[4]} 1x, {$a[3]}{$opt}{$a[4]} 2x\"";
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};
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return $a[1].$a[3].$a[4].$a[5].$add.$a[6];
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};
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$content=preg_replace_callback($pattern,"callback_func",$content);
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```
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