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PHP fu wu qi bian liang she zhi de fang fa jie shao

2008-12-22 08:07:17 编辑來源:互联网 评论
 
 
 
本文为【PHP服务器变量设置的方法介绍】的拼音翻译版
  bian liang lei xing bian hua (juggling)
  PHP bu xu yao ( huo zhe shuo bu zhi chi ) zai sheng ming bian liang ming que ta de bian liang lei xing ; yi ge bian liang de lei xing shi you zhe ge bian liang bei shi yong de qian hou guan xi lai jue ding de , ye jiu shi shuo , ru guo ni gei yi ge bian liang var fu le yi ge zi fu chuan de zhi ,var jiu bian cheng le zi fu chuan bian liang 。 ru guo ni zai jiang yi ge zheng shu fu zhi gei var, ta you bian cheng le yi ge zheng shu xing bian liang 。
  yi ge PHP zi dong zhuan hua bian liang lei xing de li zi shi jia fa de cao zuo fu ’+’。 ru guo ren he yi ge cao zuo shu dou shi shuang jing du shu , na me suo you de cao zuo shu bei dang zuo shuang jing du shu qiu zhi , bing qie jie guo ye shi shuang jing du shu 。 fou ze , cao zuo shu jiang bei ren wei shi zheng shu , jie guo ye jiang hui shi zheng shu 。 zhu yi zhe bing bu ying xiang mei ge cao zuo shu ben shen de bian liang lei xing , wei yi de bian hua jiu shi cao zuo shu zai ji suan de guo cheng zhong bei ru he chu li 。
  $foo = "0"; // $foo shi yi ge zi fu chuan , zhi shi “0”(ASCII 48)
  $foo++; // $foo shi yi ge zi fu chuan , zhi shi “1”(ASCII 49)
  $foo += 1; // $foo xian zai shi yi ge zheng shu (2) le
  $foo = $foo + 1.3; // $foo xian zai shi yi ge shuang jing du shu (3.3) le
  $foo = 5 + "10 Little Piggies"; // $foo shi yi ge zheng shu (15)
  $foo = 5 + "10 Small Pigs"; // $foo shi yi ge zheng shu (15)
  ru guo ni jiao de shang mian li zi zhong zui hou liang ge biao da shi kan qi lai you dian qi guai de hua , qing kan “ zi fu chuan de zhuan hua ” bu fen 。
  ru guo ni xi wang qiang zhi yi ge bian liang bei dang zuo mou zhong gu ding de lei xing lai ji suan , qing kan “ lei xing qiang zhi (casting)” yi jie 。 ru guo ni xi wang zhuan bian yi ge bian liang de lei xing , qing kan han shu “settype()” de shuo ming 。
  que ding yi ge bian liang de lei xing
  yin wei PHP zi ji jue ding bian liang de lei xing bing qie yi ban an zhao xu yao zhuan hua ta men , yi ge te ding de bian liang de lei xing bu shi zai ren he shi jian dou fei chang ming xian 。PHP bao kuo yi xie han shu ke yi zhao chu zhe ge bian liang de lei xing 。 zhe xie han shu shi gettype(), is_long(), is_double(), is_string(), is_array(), he is_object().
  lei xing qiang zhi (type casting)
  zai PHP zhong lei xing qiang zhi tong zai C yu yan zhong da di xiang si : jiang xu yao de lei xing de zhong lei xie zai yao qiang zhi de bian liang de qian mian de yuan kuo hao zhong 。
  $foo = 10; // $foo shi yi ge zheng shu
  $bar = (double) $foo; // $bar shi yi ge shuang jing du shu
  yi xia de qiang zhi fang shi shi yuan xu de :
  (int), (integer) – qiang zhi cheng zheng shu
  (real), (double), (float) – qiang zhi cheng shuang jing du shu
  (string) – qiang zhi cheng zi fu chuan
  (array) – qiang zhi cheng shu zu
  (object) – qiang zhi cheng dui xiang
  zhu yi zai yuan kuo hao zhong yuan xu zhi biao fu (tabs) he kong ge (spaces) , yin ci xia mian de yu ju shi deng jia de :
  $foo = (int) $bar;
  $foo = ( int ) $bar;
  zi fu chuan zhuan hua
  dang yi ge zi fu chuan bei dang zuo shu zi xing de zhi lai ji suan shi , ta de jie guo he lei xing ru xia mian suo shu de jue ding 。
  ru guo zhe ge zi fu chuan han you zi fu ’.’,’e’, huo zhe ’E’, ze bei dang zuo shuang jing du lei xing bian liang lai chu li , fou ze dang zuo shi zheng shu 。
  zhe ge zi fu chuan de zhi you ci shou bu fen jue ding 。 ru guo zhe ge zi fu chuan yi ren he you xiao de shu zi de shu ju kai shi , na me zhe ge shu zi shu ju jiu shi zhe ge zi fu chuan shen jia yun suan de zhi 。 fou ze , zhi wei ling (zero)。 you xiao de shu zi shu ju shi zun xun xia mian de zhe xie biao ji de , gen sui zai yi ge huo duo ge shu zi hou mian ( ke yi bao han xiao shu dian ), gen sui zai yi ge ke xuan de zhi shu hou mian 。 zhi shu shi you yi ge huo duo ge shu zi gen zai ’e’ huo ’E’ hou mian gou cheng de 。
  $foo = 1 + "10.5"; // $foo shi shuang jing du shu (11.5)
  $foo = 1 + "-1.3e3"; // $foo shi shuang jing du shu (-1299)
  $foo = 1 + "bob-1.3e3"; // $foo shi zheng shu (1)
  $foo = 1 + "bob3"; // $foo shi zheng shu (1)
  $foo = 1 + "10 Small Pigs"; // $foo shi zheng shu (11)
  $foo = 1 + "10 Little Piggies"; // $foo shi zheng shu (11);
  // zhe ge zi fu chuan bao kuo zi fu 'e'
  huo qu geng duo xin xi , qing shen kao Unix shou ce guan yu strtod(3) de bu fen 。【原文】【汉音对照
 
 
 
 
 
 
 
 
 
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bian liang lei xing bian hua (juggling) PHP bu xu yao ( huo zhe shuo bu zhi chi ) zai sheng ming bian liang ming que ta de bian liang lei xing ; yi ge bian liang de lei xing shi you zhe ge bian liang bei shi yong de qian hou guan xi lai jue ding de , ye jiu shi shuo , ru guo ni gei yi ge bian liang var fu le yi ge zi fu chuan de zhi ,var jiu bian cheng le zi fu chuan bian liang 。 ru guo ni zai jiang yi ge zheng shu fu zhi gei var, ta you bian cheng le yi ge zheng shu xing bian liang 。 yi ge PHP zi dong zhuan hua bian liang lei xing de li zi shi jia fa de cao zuo fu ’+’。 ru guo ren he yi ge cao zuo shu dou shi shuang jing du shu , na me suo you de cao zuo shu bei dang zuo shuang jing du shu qiu zhi , bing qie jie guo ye shi shuang jing du shu 。 fou ze , cao zuo shu jiang bei ren wei shi zheng shu , jie guo ye jiang hui shi zheng shu 。 zhu yi zhe bing bu ying xiang mei ge cao zuo shu ben shen de bian liang lei xing , wei yi de bian hua jiu shi cao zuo shu zai ji suan de guo cheng zhong bei ru he chu li 。 $foo = "0"; // $foo shi yi ge zi fu chuan , zhi shi “0”(ASCII 48) $foo++; // $foo shi yi ge zi fu chuan , zhi shi “1”(ASCII 49) $foo += 1; // $foo xian zai shi yi ge zheng shu (2) le $foo = $foo + 1.3; // $foo xian zai shi yi ge shuang jing du shu (3.3) le $foo = 5 + "10 Little Piggies"; // $foo shi yi ge zheng shu (15) $foo = 5 + "10 Small Pigs"; // $foo shi yi ge zheng shu (15) ru guo ni jiao de shang mian li zi zhong zui hou liang ge biao da shi kan qi lai you dian qi guai de hua , qing kan “ zi fu chuan de zhuan hua ” bu fen 。 ru guo ni xi wang qiang zhi yi ge bian liang bei dang zuo mou zhong gu ding de lei xing lai ji suan , qing kan “ lei xing qiang zhi (casting)” yi jie 。 ru guo ni xi wang zhuan bian yi ge bian liang de lei xing , qing kan han shu “settype()” de shuo ming 。 que ding yi ge bian liang de lei xing yin wei PHP zi ji jue ding bian liang de lei xing bing qie yi ban an zhao xu yao zhuan hua ta men , yi ge te ding de bian liang de lei xing bu shi zai ren he shi jian dou fei chang ming xian 。PHP bao kuo yi xie han shu ke yi zhao chu zhe ge bian liang de lei xing 。 zhe xie han shu shi gettype(), is_long(), is_double(), is_string(), is_array(), he is_object(). lei xing qiang zhi (type casting) zai PHP zhong lei xing qiang zhi tong zai C yu yan zhong da di xiang si : jiang xu yao de lei xing de zhong lei xie zai yao qiang zhi de bian liang de qian mian de yuan kuo hao zhong 。 $foo = 10; // $foo shi yi ge zheng shu $bar = (double) $foo; // $bar shi yi ge shuang jing du shu yi xia de qiang zhi fang shi shi yuan xu de : (int), (integer) – qiang zhi cheng zheng shu (real), (double), (float) – qiang zhi cheng shuang jing du shu (string) – qiang zhi cheng zi fu chuan (array) – qiang zhi cheng shu zu (object) – qiang zhi cheng dui xiang zhu yi zai yuan kuo hao zhong yuan xu zhi biao fu (tabs) he kong ge (spaces) , yin ci xia mian de yu ju shi deng jia de : $foo = (int) $bar; $foo = ( int ) $bar; zi fu chuan zhuan hua dang yi ge zi fu chuan bei dang zuo shu zi xing de zhi lai ji suan shi , ta de jie guo he lei xing ru xia mian suo shu de jue ding 。 ru guo zhe ge zi fu chuan han you zi fu ’.’,’e’, huo zhe ’E’, ze bei dang zuo shuang jing du lei xing bian liang lai chu li , fou ze dang zuo shi zheng shu 。 zhe ge zi fu chuan de zhi you ci shou bu fen jue ding 。 ru guo zhe ge zi fu chuan yi ren he you xiao de shu zi de shu ju kai shi , na me zhe ge shu zi shu ju jiu shi zhe ge zi fu chuan shen jia yun suan de zhi 。 fou ze , zhi wei ling (zero)。 you xiao de shu zi shu ju shi zun xun xia mian de zhe xie biao ji de , gen sui zai yi ge huo duo ge shu zi hou mian ( ke yi bao han xiao shu dian ), gen sui zai yi ge ke xuan de zhi shu hou mian 。 zhi shu shi you yi ge huo duo ge shu zi gen zai ’e’ huo ’E’ hou mian gou cheng de 。 $foo = 1 + "10.5"; // $foo shi shuang jing du shu (11.5) $foo = 1 + "-1.3e3"; // $foo shi shuang jing du shu (-1299) $foo = 1 + "bob-1.3e3"; // $foo shi zheng shu (1) $foo = 1 + "bob3"; // $foo shi zheng shu (1) $foo = 1 + "10 Small Pigs"; // $foo shi zheng shu (11) $foo = 1 + "10 Little Piggies"; // $foo shi zheng shu (11); // zhe ge zi fu chuan bao kuo zi fu 'e' huo qu geng duo xin xi , qing shen kao Unix shou ce guan yu strtod(3) de bu fen 。
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