代码编辑器：
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echo substr_compare("Hello world!","Hello world!",0),'<br/>'; 4
echo substr_compare("Hello world!","Hello",0),'<br/>'; 5
echo substr_compare("Hello world!","Hello world! Hello!",0),'<br/>'; 6
echo substr_compare("Hello world!","Hello world!",0),'<br/>'; echo substr_compare("Hello world!","Hello",0),'<br/>'; echo substr_compare("Hello world!","Hello world! Hello!",0),'<br/>';