如题所述
ä¸é¢ä¸»è¦è®²è¿° round, floor, ceil, pow, rand,max, min, decbin, bindec, dechex, hexdec, decoct, octdec å½æ°ã
round
round - 对浮ç¹æ°è¿è¡åèäºå ¥ãround å½æ°è¯æ³å¦ä¸ï¼
round(float,precision)
å ¶ä¸åæ° precision 表示å°æ°ç¹åé¢è¦ä¿æç精度ä½æ°ãå¦æä¸ååæ° precisionï¼è¡¨ç¤ºåèäºå ¥å°æ´æ°ä½ï¼æ¯å¦ï¼
echo round(3.4); // 3echo round(3.5); // 4echo round(3.6); // 4
å¦æ precision 为2ï¼è¡¨ç¤ºåèäºå ¥å°å°æ°ç¹å2ä½ã示ä¾å¦ä¸ï¼
echo round(1.95583, 2); // 1.96
å¦æåæ° precision 为è´æ°ï¼è¡¨ç¤ºåèäºå ¥å°å°æ°ç¹åãæ¯å¦ï¼
echo round(1241757, -3); // 1242000
floor
floor - èå»æ³æ±æ´ãfloor å½æ°è¯æ³å¦ä¸ï¼
floor (value)
floor å½æ°è¿åä¸å¤§äº value çæ大æ´æ°ï¼å³å° value çå°æ°é¨åèå»åæ´ã示ä¾å¦ä¸ï¼
echo floor(4); //4
echo floor(4.3); // 4echo floor(9.999); // 9
ceil
ceil - è¿ä¸æ³åæ´ãceil å½æ°è¯æ³å¦ä¸ï¼
ceil (value)
ceil å½æ°è¿åä¸å°äº value çæå°æ´æ°ã示ä¾å¦ä¸ï¼
echo ceil(4); //4
echo ceil(4.3); // 5echo ceil(9.999); // 10
pow
pow - æ±å¹ãpow å½æ°çè¯æ³å¦ä¸ï¼
pow (base,exp)
pow å½æ°è¿å base ç exp 次æ¹çå¹ãä¸é¢ç示ä¾è¡¨ç¤ºæ± 2 ç8 次æ¹ï¼è¿åç»ææ¯256ã
echo pow(2, 8); // 256
rand
rand - 产çä¸ä¸ªéæºæ´æ°ãrand å½æ°è¯æ³å¦ä¸ï¼
rand (min,max)
rand å½æ°è¿åä¸ä¸ªä»äºæå°å¼ min åæå¤§å¼ max ä¹é´ (å æ¬min, max) çéæºæ´æ°ãæ¯å¦ä¸é¢ç¤ºä¾è¿åä¸ä¸ª 2 å° 6 ä¹é´çéæºæ´æ°ã
echo rand(2,6);
max
max - è¿ååæ°ä¸æ°å¼æ大çå¼ã
å¦æ max å½æ°åªæä¸ä¸ªåæ°ä¸ä¸ºæ°ç»ï¼max è¿å该æ°ç»ä¸æ大çå¼ã
max å½æ°ç¤ºä¾å¦ä¸ï¼
echo max(1, 3, 5, 6, 7); // 7echo max(array(2, 4, 5)); // 5
min
min - è¿ååæ°ä¸çæå°å¼ã
å¦æ min å½æ°åªæä¸ä¸ªåæ°ä¸ä¸ºæ°ç»ï¼min è¿å该æ°ç»ä¸æå°çå¼ã
min å½æ°ç¤ºä¾å¦ä¸ï¼
echo min(1, 3, 5, 6, 7); // 1echo min(array(2, 4, 5)); // 2
decbin
decbin - åè¿å¶è½¬æ¢ä¸ºäºè¿å¶ãdecbin å½æ°è¯æ³å¦ä¸ï¼
decbin (number)
decbin è¿åä¸ä¸ªå符串ï¼å³è¿ååæ° number çäºè¿å¶è¡¨ç¤ºã示ä¾å¦ä¸ï¼
echo decbin(12);
DE>decbin(12)DE> è¿åçç»ææ¯ï¼
1100
bindec
bindec - äºè¿å¶è½¬æ¢æåè¿å¶ãbindec å½æ°è¯æ³å¦ä¸ï¼
bindec (binary_string)
bindec å½æ°å°äºè¿å¶å符串 binary_string 转æ¢æä¸ä¸ªåè¿å¶æ´æ°ã示ä¾å¦ä¸ï¼
echo bindec('110011'); //51
dechex, hexdec
dechex - åè¿å¶è½¬æ¢ä¸ºåå è¿å¶ã
hexdec - åå è¿å¶è½¬æ¢ä¸ºåè¿å¶ã
dechex, hexdec å½æ°ç¤ºä¾å¦ä¸ï¼
echo dechex(47); //2f
echo hexdec('2f'); //47
decoct, octdec
decoct - åè¿å¶è½¬æ¢ä¸ºå «è¿å¶
octdec - å «è¿å¶è½¬æ¢ä¸ºåè¿å¶
decoctï¼octdec å½æ°ç¤ºä¾å¦ä¸ï¼
echo decoct(12); //14
echo octdec('14'); //12
round
round - 对浮ç¹æ°è¿è¡åèäºå ¥ãround å½æ°è¯æ³å¦ä¸ï¼
round(float,precision)
å ¶ä¸åæ° precision 表示å°æ°ç¹åé¢è¦ä¿æç精度ä½æ°ãå¦æä¸ååæ° precisionï¼è¡¨ç¤ºåèäºå ¥å°æ´æ°ä½ï¼æ¯å¦ï¼
echo round(3.4); // 3echo round(3.5); // 4echo round(3.6); // 4
å¦æ precision 为2ï¼è¡¨ç¤ºåèäºå ¥å°å°æ°ç¹å2ä½ã示ä¾å¦ä¸ï¼
echo round(1.95583, 2); // 1.96
å¦æåæ° precision 为è´æ°ï¼è¡¨ç¤ºåèäºå ¥å°å°æ°ç¹åãæ¯å¦ï¼
echo round(1241757, -3); // 1242000
floor
floor - èå»æ³æ±æ´ãfloor å½æ°è¯æ³å¦ä¸ï¼
floor (value)
floor å½æ°è¿åä¸å¤§äº value çæ大æ´æ°ï¼å³å° value çå°æ°é¨åèå»åæ´ã示ä¾å¦ä¸ï¼
echo floor(4); //4
echo floor(4.3); // 4echo floor(9.999); // 9
ceil
ceil - è¿ä¸æ³åæ´ãceil å½æ°è¯æ³å¦ä¸ï¼
ceil (value)
ceil å½æ°è¿åä¸å°äº value çæå°æ´æ°ã示ä¾å¦ä¸ï¼
echo ceil(4); //4
echo ceil(4.3); // 5echo ceil(9.999); // 10
pow
pow - æ±å¹ãpow å½æ°çè¯æ³å¦ä¸ï¼
pow (base,exp)
pow å½æ°è¿å base ç exp 次æ¹çå¹ãä¸é¢ç示ä¾è¡¨ç¤ºæ± 2 ç8 次æ¹ï¼è¿åç»ææ¯256ã
echo pow(2, 8); // 256
rand
rand - 产çä¸ä¸ªéæºæ´æ°ãrand å½æ°è¯æ³å¦ä¸ï¼
rand (min,max)
rand å½æ°è¿åä¸ä¸ªä»äºæå°å¼ min åæå¤§å¼ max ä¹é´ (å æ¬min, max) çéæºæ´æ°ãæ¯å¦ä¸é¢ç¤ºä¾è¿åä¸ä¸ª 2 å° 6 ä¹é´çéæºæ´æ°ã
echo rand(2,6);
max
max - è¿ååæ°ä¸æ°å¼æ大çå¼ã
å¦æ max å½æ°åªæä¸ä¸ªåæ°ä¸ä¸ºæ°ç»ï¼max è¿å该æ°ç»ä¸æ大çå¼ã
max å½æ°ç¤ºä¾å¦ä¸ï¼
echo max(1, 3, 5, 6, 7); // 7echo max(array(2, 4, 5)); // 5
min
min - è¿ååæ°ä¸çæå°å¼ã
å¦æ min å½æ°åªæä¸ä¸ªåæ°ä¸ä¸ºæ°ç»ï¼min è¿å该æ°ç»ä¸æå°çå¼ã
min å½æ°ç¤ºä¾å¦ä¸ï¼
echo min(1, 3, 5, 6, 7); // 1echo min(array(2, 4, 5)); // 2
decbin
decbin - åè¿å¶è½¬æ¢ä¸ºäºè¿å¶ãdecbin å½æ°è¯æ³å¦ä¸ï¼
decbin (number)
decbin è¿åä¸ä¸ªå符串ï¼å³è¿ååæ° number çäºè¿å¶è¡¨ç¤ºã示ä¾å¦ä¸ï¼
echo decbin(12);
DE>decbin(12)DE> è¿åçç»ææ¯ï¼
1100
bindec
bindec - äºè¿å¶è½¬æ¢æåè¿å¶ãbindec å½æ°è¯æ³å¦ä¸ï¼
bindec (binary_string)
bindec å½æ°å°äºè¿å¶å符串 binary_string 转æ¢æä¸ä¸ªåè¿å¶æ´æ°ã示ä¾å¦ä¸ï¼
echo bindec('110011'); //51
dechex, hexdec
dechex - åè¿å¶è½¬æ¢ä¸ºåå è¿å¶ã
hexdec - åå è¿å¶è½¬æ¢ä¸ºåè¿å¶ã
dechex, hexdec å½æ°ç¤ºä¾å¦ä¸ï¼
echo dechex(47); //2f
echo hexdec('2f'); //47
decoct, octdec
decoct - åè¿å¶è½¬æ¢ä¸ºå «è¿å¶
octdec - å «è¿å¶è½¬æ¢ä¸ºåè¿å¶
decoctï¼octdec å½æ°ç¤ºä¾å¦ä¸ï¼
echo decoct(12); //14
echo octdec('14'); //12
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