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PHPzCorrection status：qualified
Teacher's comments：示例使用的数据量不宜过大，起到示例作用即可
Collection
Collection
练习要求：
// 1、把省市区 数组，循环一遍
// 2、用 echo 输出单个值，用print_r()打印其中一个城市和区
// 可以用2个循环，或者3个循环。 省市区数据，在最下方
1.把省市区 数组，循环一遍
代码：
foreach($arr as $k => $v){echo "省份：".$arr[$k][ 'area_name'];//省echo "->";foreach($arr[$k][ 'son'] as $k1 => $v1){echo "<P></P>";echo "城市：".$arr[$k][ 'son'][$k1][ 'area_name'];//市echo "-->";echo "<P></P>";echo " 区县：";foreach($arr[$k][ 'son'][$k1][ 'son'] as $k2 => $v2){echo $arr[$k][ 'son'][$k1][ 'son'][$k2][ 'area_name'];//区echo '|';}}echo "<hr>";}
效果：
2、用 echo 输出单个值，用print_r()打印其中一个城市和区
代码：
echo '城市：';print_r($arr[0]['son'][0]['area_name']);echo "<P></P>";echo '区：';print_r($arr[0]['son'][0]['son']);
效果：
数组代码：
$arr = [['area_id' => 110000,'area_pid' => 0,'area_name' => '北京','lng' => 116.405,'lat' => 39.905,'son' => [['area_id' => 110100,'area_pid' => 110000,'area_name' => '北京市','lng' => 116.405,'lat' => 39.905,'son' => [['area_id' => 110101,'area_pid' => 110100,'area_name' => '东城区','lng' => 116.41,'lat' => 39.9316],['area_id' => 110102,'area_pid' => 110100,'area_name' => '西城区','lng' => 116.36,'lat' => 39.9305],['area_id' => 110105,'area_pid' => 110100,'area_name' => '朝阳区','lng' => 116.485,'lat' => 39.9484],['area_id' => 110106,'area_pid' => 110100,'area_name' => '丰台区','lng' => 116.286,'lat' => 39.8585],['area_id' => 110107,'area_pid' => 110100,'area_name' => '石景山区','lng' => 116.223,'lat' => 39.9056],['area_id' => 110108,'area_pid' => 110100,'area_name' => '海淀区','lng' => 116.298,'lat' => 39.9593],['area_id' => 110109,'area_pid' => 110100,'area_name' => '门头沟区','lng' => 116.101,'lat' => 39.9404],['area_id' => 110111,'area_pid' => 110100,'area_name' => '房山区','lng' => 116.143,'lat' => 39.7479],['area_id' => 110112,'area_pid' => 110100,'area_name' => '通州区','lng' => 116.657,'lat' => 39.9097],['area_id' => 110113,'area_pid' => 110100,'area_name' => '顺义区','lng' => 116.654,'lat' => 40.1302],['area_id' => 110114,'area_pid' => 110100,'area_name' => '昌平区','lng' => 116.231,'lat' => 40.2207],['area_id' => 110115,'area_pid' => 110100,'area_name' => '大兴区','lng' => 116.341,'lat' => 39.7267],['area_id' => 110116,'area_pid' => 110100,'area_name' => '怀柔区','lng' => 116.632,'lat' => 40.316],['area_id' => 110117,'area_pid' => 110100,'area_name' => '平谷区','lng' => 117.121,'lat' => 40.1406],['area_id' => 110228,'area_pid' => 110100,'area_name' => '密云县','lng' => 116.843,'lat' => 40.3762],['area_id' => 110229,'area_pid' => 110100,'area_name' => '延庆县','lng' => 115.975,'lat' => 40.4567]]]]],['area_id' => 120000,'area_pid' => 0,'area_name' => '天津','lng' => 117.19,'lat' => 39.1256,'son' => [['area_id' => 120100,'area_pid' => 120000,'area_name' => '天津市','lng' => 117.19,'lat' => 39.1256,'son' => [['area_id' => 120101,'area_pid' => 120100,'area_name' => '和平区','lng' => 117.215,'lat' => 39.1172],['area_id' => 120102,'area_pid' => 120100,'area_name' => '河东区','lng' => 117.226,'lat' => 39.1232],['area_id' => 120103,'area_pid' => 120100,'area_name' => '河西区','lng' => 117.223,'lat' => 39.1096],['area_id' => 120104,'area_pid' => 120100,'area_name' => '南开区','lng' => 117.151,'lat' => 39.1382],['area_id' => 120105,'area_pid' => 120100,'area_name' => '河北区','lng' => 117.197,'lat' => 39.1482],['area_id' => 120106,'area_pid' => 120100,'area_name' => '红桥区','lng' => 117.151,'lat' => 39.1671],['area_id' => 120110,'area_pid' => 120100,'area_name' => '东丽区','lng' => 117.314,'lat' => 39.0863],['area_id' => 120111,'area_pid' => 120100,'area_name' => '西青区','lng' => 117.009,'lat' => 39.1412],['area_id' => 120112,'area_pid' => 120100,'area_name' => '津南区','lng' => 117.385,'lat' => 38.9914],['area_id' => 120113,'area_pid' => 120100,'area_name' => '北辰区','lng' => 117.132,'lat' => 39.2213],['area_id' => 120114,'area_pid' => 120100,'area_name' => '武清区','lng' => 117.044,'lat' => 39.3842],['area_id' => 120115,'area_pid' => 120100,'area_name' => '宝坻区','lng' => 117.31,'lat' => 39.7176],['area_id' => 120116,'area_pid' => 120100,'area_name' => '滨海新区','lng' => 117.702,'lat' => 39.0267],['area_id' => 120221,'area_pid' => 120100,'area_name' => '宁河县','lng' => 117.826,'lat' => 39.3305],['area_id' => 120223,'area_pid' => 120100,'area_name' => '静海县','lng' => 116.974,'lat' => 38.9458],['area_id' => 120225,'area_pid' => 120100,'area_name' => '蓟县','lng' => 117.408,'lat' => 40.0457]]]]],['area_id' => 130000,'area_pid' => 0,'area_name' => '河北省','lng' => 114.502,'lat' => 38.0455,'son' => [['area_id' => 130100,'area_pid' => 130000,'area_name' => '石家庄市','lng' => 114.502,'lat' => 38.0455,'son' => [['area_id' => 130102,'area_pid' => 130100,'area_name' => '长安区','lng' => 114.539,'lat' => 38.0367,],['area_id' => 130104,'area_pid' => 130100,'area_name' => '桥西区','lng' => 114.47,'lat' => 38.0322],['area_id' => 130105,'area_pid' => 130100,'area_name' => '新华区','lng' => 114.463,'lat' => 38.0509],['area_id' => 130107,'area_pid' => 130100,'area_name' => '井陉矿区','lng' => 114.065,'lat' => 38.0671],['area_id' => 130108,'area_pid' => 130100,'area_name' => '裕华区','lng' => 114.531,'lat' => 38.006],['area_id' => 130109,'area_pid' => 130100,'area_name' => '藁城区','lng' => 114.847,'lat' => 38.0216],['area_id' => 130110,'area_pid' => 130100,'area_name' => '鹿泉区','lng' => 114.313,'lat' => 38.0878],['area_id' => 130111,'area_pid' => 130100,'area_name' => '栾城区','lng' => 114.648,'lat' => 37.9002],['area_id' => 130121,'area_pid' => 130100,'area_name' => '井陉县','lng' => 114.143,'lat' => 38.0369],['area_id' => 130123,'area_pid' => 130100,'area_name' => '正定县','lng' => 114.573,'lat' => 38.1445],['area_id' => 130125,'area_pid' => 130100,'area_name' => '行唐县','lng' => 114.553,'lat' => 38.4365],['area_id' => 130126,'area_pid' => 130100,'area_name' => '灵寿县','lng' => 114.383,'lat' => 38.3084],['area_id' => 130127,'area_pid' => 130100,'area_name' => '高邑县','lng' => 114.611,'lat' => 37.6156],['area_id' => 130128,'area_pid' => 130100,'area_name' => '深泽县','lng' => 115.204,'lat' => 38.1835],['area_id' => 130129,'area_pid' => 130100,'area_name' => '赞皇县','lng' => 114.388,'lat' => 37.6614],['area_id' => 130130,'area_pid' => 130100,'area_name' => '无极县','lng' => 114.975,'lat' => 38.1765],['area_id' => 130131,'area_pid' => 130100,'area_name' => '平山县','lng' => 114.186,'lat' => 38.2599],['area_id' => 130132,'area_pid' => 130100,'area_name' => '元氏县','lng' => 114.525,'lat' => 37.7667],['area_id' => 130133,'area_pid' => 130100,'area_name' => '赵县','lng' => 114.776,'lat' => 37.7563],['area_id' => 130181,'area_pid' => 130100,'area_name' => '辛集市','lng' => 115.206,'lat' => 37.9408],['area_id' => 130183,'area_pid' => 130100,'area_name' => '晋州市','lng' => 115.043,'lat' => 38.0313],['area_id' => 130184,'area_pid' => 130100,'area_name' => '新乐市','lng' => 114.69,'lat' => 38.3442]]],['area_id' => 130200,'area_pid' => 130000,'area_name' => '唐山市','lng' => 118.175,'lat' => 39.6351,'son' => [['area_id' => 130284,'area_pid' => 130200,'area_name' => '滦州市','lng' => '','lat' => ''],['area_id' => 130202,'area_pid' => 130200,'area_name' => '路南区','lng' => 118.154,'lat' => 39.625,],['area_id' => 130203,'area_pid' => 130200,'area_name' => '路北区','lng' => 118.201,'lat' => 39.6244],['area_id' => 130204,'area_pid' => 130200,'area_name' => '古冶区','lng' => 118.458,'lat' => 39.7199],['area_id' => 130205,'area_pid' => 130200,'area_name' => '开平区','lng' => 118.262,'lat' => 39.6713],['area_id' => 130207,'area_pid' => 130200,'area_name' => '丰南区','lng' => 118.113,'lat' => 39.5648],['area_id' => 130208,'area_pid' => 130200,'area_name' => '丰润区','lng' => 118.13,'lat' => 39.8244],['area_id' => 130209,'area_pid' => 130200,'area_name' => '曹妃甸区','lng' => 118.46,'lat' => 39.2731],['area_id' => 130223,'area_pid' => 130200,'area_name' => '滦县','lng' => 118.703,'lat' => 39.7406],['area_id' => 130224,'area_pid' => 130200,'area_name' => '滦南县','lng' => 118.674,'lat' => 39.5039],['area_id' => 130225,'area_pid' => 130200,'area_name' => '乐亭县','lng' => 118.912,'lat' => 39.4256],['area_id' => 130227,'area_pid' => 130200,'area_name' => '迁西县','lng' => 118.316,'lat' => 40.1459],['area_id' => 130229,'area_pid' => 130200,'area_name' => '玉田县','lng' => 117.739,'lat' => 39.9005],['area_id' => 130281,'area_pid' => 130200,'area_name' => '遵化市','lng' => 117.964,'lat' => 40.1874],['area_id' => 130283,'area_pid' => 130200,'area_name' => '迁安市','lng' => 118.701,'lat' => 39.9983]]],['area_id' => 130300,'area_pid' => 130000,'area_name' => '秦皇岛市','lng' => 119.587,'lat' => 39.9425,'son' => [['area_id' => 130302,'area_pid' => 130300,'area_name' => '海港区','lng' => 119.61,'lat' => 39.9345],['area_id' => 130303,'area_pid' => 130300,'area_name' => '山海关区','lng' => 119.776,'lat' => 39.9787],['area_id' => 130304,'area_pid' => 130300,'area_name' => '北戴河区','lng' => 119.484,'lat' => 39.8341],['area_id' => 130321,'area_pid' => 130300,'area_name' => '青龙满族自治县','lng' => 118.952,'lat' => 40.4074],['area_id' => 130322,'area_pid' => 130300,'area_name' => '昌黎县','lng' => 119.166,'lat' => 39.7088],['area_id' => 130323,'area_pid' => 130300,'area_name' => '抚宁县','lng' => 119.245,'lat' => 39.8754],['area_id' => 130324,'area_pid' => 130300,'area_name' => '卢龙县','lng' => 118.893,'lat' => 39.8918]]],['area_id' => 130400,'area_pid' => 130000,'area_name' => '邯郸市','lng' => 114.491,'lat' => 36.6123,'son' => [['area_id' => 130402,'area_pid' => 130400,'area_name' => '邯山区','lng' => 114.484,'lat' => 36.6001],['area_id' => 130403,'area_pid' => 130400,'area_name' => '丛台区','lng' => 114.493,'lat' => 36.6185],['area_id' => 130404,'area_pid' => 130400,'area_name' => '复兴区','lng' => 114.459,'lat' => 36.6113],['area_id' => 130406,'area_pid' => 130400,'area_name' => '峰峰矿区','lng' => 114.211,'lat' => 36.4194],['area_id' => 130421,'area_pid' => 130400,'area_name' => '邯郸县','lng' => 114.531,'lat' => 36.5938],['area_id' => 130423,'area_pid' => 130400,'area_name' => '临漳县','lng' => 114.619,'lat' => 36.3346],['area_id' => 130424,'area_pid' => 130400,'area_name' => '成安县','lng' => 114.67,'lat' => 36.4441],['area_id' => 130425,'area_pid' => 130400,'area_name' => '大名县','lng' => 115.154,'lat' => 36.2799],['area_id' => 130426,'area_pid' => 130400,'area_name' => '涉县','lng' => 113.692,'lat' => 36.5807],['area_id' => 130427,'area_pid' => 130400,'area_name' => '磁县','lng' => 114.374,'lat' => 36.3739],['area_id' => 130428,'area_pid' => 130400,'area_name' => '肥乡县','lng' => 114.8,'lat' => 36.5481],['area_id' => 130429,'area_pid' => 130400,'area_name' => '永年县','lng' => 114.489,'lat' => 36.7836],['area_id' => 130430,'area_pid' => 130400,'area_name' => '邱县','lng' => 115.174,'lat' => 36.8208],['area_id' => 130431,'area_pid' => 130400,'area_name' => '鸡泽县','lng' => 114.874,'lat' => 36.9237],['area_id' => 130432,'area_pid' => 130400,'area_name' => '广平县','lng' => 114.947,'lat' => 36.4805],['area_id' => 130433,'area_pid' => 130400,'area_name' => '馆陶县','lng' => 115.299,'lat' => 36.5372],['area_id' => 130434,'area_pid' => 130400,'area_name' => '魏县','lng' => 114.935,'lat' => 36.3617],['area_id' => 130435,'area_pid' => 130400,'area_name' => '曲周县','lng' => 114.952,'lat' => 36.7767],['area_id' => 130481,'area_pid' => 130400,'area_name' => '武安市','lng' => 114.202,'lat' => 36.6928]]],['area_id' => 130500,'area_pid' => 130000,'area_name' => '邢台市','lng' => 114.509,'lat' => 37.0682,'son' => [['area_id' => 130502,'area_pid' => 130500,'area_name' => '桥东区','lng' => 114.507,'lat' => 37.068],['area_id' => 130503,'area_pid' => 130500,'area_name' => '桥西区','lng' => 114.468,'lat' => 37.0598],['area_id' => 130521,'area_pid' => 130500,'area_name' => '邢台县','lng' => 114.566,'lat' => 37.0456],['area_id' => 130522,'area_pid' => 130500,'area_name' => '临城县','lng' => 114.504,'lat' => 37.4398],['area_id' => 130523,'area_pid' => 130500,'area_name' => '内丘县','lng' => 114.512,'lat' => 37.2867],['area_id' => 130524,'area_pid' => 130500,'area_name' => '柏乡县','lng' => 114.693,'lat' => 37.4824],['area_id' => 130525,'area_pid' => 130500,'area_name' => '隆尧县','lng' => 114.776,'lat' => 37.3535],['area_id' => 130526,'area_pid' => 130500,'area_name' => '任县','lng' => 114.684,'lat' => 37.1258],['area_id' => 130527,'area_pid' => 130500,'area_name' => '南和县','lng' => 114.684,'lat' => 37.0049],['area_id' => 130528,'area_pid' => 130500,'area_name' => '宁晋县','lng' => 114.921,'lat' => 37.617],['area_id' => 130529,'area_pid' => 130500,'area_name' => '巨鹿县','lng' => 115.035,'lat' => 37.218],['area_id' => 130530,'area_pid' => 130500,'area_name' => '新河县','lng' => 115.25,'lat' => 37.5272],['area_id' => 130531,'area_pid' => 130500,'area_name' => '广宗县','lng' => 115.143,'lat' => 37.0746],['area_id' => 130532,'area_pid' => 130500,'area_name' => '平乡县','lng' => 115.03,'lat' => 37.0632],['area_id' => 130533,'area_pid' => 130500,'area_name' => '威县','lng' => 115.264,'lat' => 36.9768],['area_id' => 130534,'area_pid' => 130500,'area_name' => '清河县','lng' => 115.665,'lat' => 37.0712],['area_id' => 130535,'area_pid' => 130500,'area_name' => '临西县','lng' => 115.501,'lat' => 36.8708],['area_id' => 130581,'area_pid' => 130500,'area_name' => '南宫市','lng' => 115.391,'lat' => 37.358],['area_id' => 130582,'area_pid' => 130500,'area_name' => '沙河市','lng' => 114.498,'lat' => 36.8577]]],['area_id' => 130600,'area_pid' => 130000,'area_name' => '保定市','lng' => 115.482,'lat' => 38.8677,'son' => [['area_id' => 130602,'area_pid' => 130600,'area_name' => '新市区','lng' => 115.459,'lat' => 38.8775],['area_id' => 130603,'area_pid' => 130600,'area_name' => '北市区','lng' => 115.497,'lat' => 38.8832],['area_id' => 130604,'area_pid' => 130600,'area_name' => '南市区','lng' => 115.529,'lat' => 38.8545],['area_id' => 130621,'area_pid' => 130600,'area_name' => '满城县','lng' => 115.323,'lat' => 38.9497],['area_id' => 130622,'area_pid' => 130600,'area_name' => '清苑县','lng' => 115.493,'lat' => 38.7671],['area_id' => 130623,'area_pid' => 130600,'area_name' => '涞水县','lng' => 115.715,'lat' => 39.394],['area_id' => 130624,'area_pid' => 130600,'area_name' => '阜平县','lng' => 114.197,'lat' => 38.8476],['area_id' => 130625,'area_pid' => 130600,'area_name' => '徐水县','lng' => 115.658,'lat' => 39.021],['area_id' => 130626,'area_pid' => 130600,'area_name' => '定兴县','lng' => 115.808,'lat' => 39.2631],['area_id' => 130627,'area_pid' => 130600,'area_name' => '唐县','lng' => 114.985,'lat' => 38.7451],['area_id' => 130628,'area_pid' => 130600,'area_name' => '高阳县','lng' => 115.779,'lat' => 38.7],['area_id' => 130629,'area_pid' => 130600,'area_name' => '容城县','lng' => 115.872,'lat' => 39.0535],['area_id' => 130630,'area_pid' => 130600,'area_name' => '涞源县','lng' => 114.691,'lat' => 39.3539],['area_id' => 130631,'area_pid' => 130600,'area_name' => '望都县','lng' => 115.157,'lat' => 38.71],['area_id' => 130632,'area_pid' => 130600,'area_name' => '安新县','lng' => 115.936,'lat' => 38.9353],['area_id' => 130633,'area_pid' => 130600,'area_name' => '易县','lng' => 115.498,'lat' => 39.3489],['area_id' => 130634,'area_pid' => 130600,'area_name' => '曲阳县','lng' => 114.701,'lat' => 38.6215],['area_id' => 130635,'area_pid' => 130600,'area_name' => '蠡县','lng' => 115.577,'lat' => 38.4897],['area_id' => 130636,'area_pid' => 130600,'area_name' => '顺平县','lng' => 115.135,'lat' => 38.8385],['area_id' => 130637,'area_pid' => 130600,'area_name' => '博野县','lng' => 115.47,'lat' => 38.4564],['area_id' => 130638,'area_pid' => 130600,'area_name' => '雄县','lng' => 116.109,'lat' => 38.9944],['area_id' => 130681,'area_pid' => 130600,'area_name' => '涿州市','lng' => 115.981,'lat' => 39.4862],['area_id' => 130682,'area_pid' => 130600,'area_name' => '定州市','lng' => 114.99,'lat' => 38.5162],['area_id' => 130683,'area_pid' => 130600,'area_name' => '安国市','lng' => 115.323,'lat' => 38.4139],['area_id' => 130684,'area_pid' => 130600,'area_name' => '高碑店市','lng' => 115.874,'lat' => 39.3265]]],['area_id' => 130700,'area_pid' => 130000,'area_name' => '张家口市','lng' => 114.884,'lat' => 40.8119,'son' => [['area_id' => 130702,'area_pid' => 130700,'area_name' => '桥东区','lng' => 114.894,'lat' => 40.7884],['area_id' => 130703,'area_pid' => 130700,'area_name' => '桥西区','lng' => 114.87,'lat' => 40.8195],['area_id' => 130705,'area_pid' => 130700,'area_name' => '宣化区','lng' => 115.065,'lat' => 40.6096],['area_id' => 130706,'area_pid' => 130700,'area_name' => '下花园区','lng' => 115.287,'lat' => 40.5024],['area_id' => 130721,'area_pid' => 130700,'area_name' => '宣化县','lng' => 115.155,'lat' => 40.5662],['area_id' => 130722,'area_pid' => 130700,'area_name' => '张北县','lng' => 114.714,'lat' => 41.1598],['area_id' => 130723,'area_pid' => 130700,'area_name' => '康保县','lng' => 114.6,'lat' => 41.8522],['area_id' => 130724,'area_pid' => 130700,'area_name' => '沽源县','lng' => 115.689,'lat' => 41.6696],['area_id' => 130725,'area_pid' => 130700,'area_name' => '尚义县','lng' => 113.971,'lat' => 41.0778],['area_id' => 130726,'area_pid' => 130700,'area_name' => '蔚县','lng' => 114.589,'lat' => 39.8407],['area_id' => 130727,'area_pid' => 130700,'area_name' => 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