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                [TOC] # 需求 我們現在在機場有一些登機口需要拆分開來 ~~~ $gates=[ 'BaiYun_A_A17', 'BeiJing_J7', 'ShuangLiu_K203', 'HongQiao_A157', 'A2', 'BaiYun_B_B230' ]; ~~~ 變成 ~~~ $boards=[ 'A17', 'J7', 'K203', 'A157', 'A2', 'B230' ]; ~~~ 我們要取每個元素的_后面的部分 # 第一種 遍歷每個元素對每個元素中_進行找尋,找到了就對這部分截取 ~~~ $rel=collect($gates)->map(function($gates){ $underscorePosition=strrpos($gates,'_'); $offset=$underscorePosition+1; return mb_substr($gates,$offset); }); ~~~ 但是缺點就是有個A2,他變成了2,我們想取A2,變2的原因是我們沒有找到_但是我們mb_string了 改進 ~~~ $rel=collect($gates)->map(function($gates){ //判斷這個字符串有沒有包含_ if (strrpos($gates,'_')===false) { return $gates; } $underscorePosition=strrpos($gates,'_'); $offset=$underscorePosition+1; return mb_substr($gates,$offset); }); ~~~ # 第二種 ~~~ $rel=collect($gates)->map(function($gates){ //切割數組 $parts=explode('_',$gates); //取最后一個元素 return end($parts); }); ~~~ ~~~ //主要這樣是不可以的end里面要是個變量, //不能是函數返回的結果,php書冊看 //return end(explode('_',$gates)); ~~~ # 第三種 ~~~ $rel=collect($gates)->map(function($gates){ return collect(explode('_',$gates))->last(); })->toArray(); ~~~
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