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function startsWith(){
       $string1 = "XXXX";
       $string2 = "XXXX";
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            return false;                                   //·ñÔòsubstr_compareÓöµ½ÕâÖÖÇé¿ö»á·µ»Ø0£¨¼´Ï൱£¬ÓëÊÂʵ²»·ûºÏ£©
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}
function endsWith(){
       $string1 = "XXXX";
       $string2 = "XXXX";
       if(strlen($string1


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php:
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